My dear humble fellow-beings
Waheguru Ji Ka Khalsa
Waheguru Ji Ki Fateh
First of all, I shall seek courage from the merciful Waheguru to give me strength to present the truth as per all His grace that He is going to shower upon me while responding to these posts.
Then, I shall like to correct you where you say their Guru Nanak. Guru Nanak, is the messenger of God just like Prophet Hazrat Mohammed Sahib. Guru Nanak says in Raga Tilang (Sri Guru Granth Sahib - 722)
ਜੈਸੀ ਮੈ ਆਵੇ ਖਸਮ ਕੀ ਬਾਨੀ ਤੈਸੜਾ ਕਰੀ ਿਗਆਨ ਵੇ ਲਾਲੋ
Jaisi Meh Aavey Khasam Ki Baani Taisra Kari Gyaan Ve Laalo.
(As the Word of the Forgiving Lord comes to me, so do I express it, O Lalo.)
Messengers do not belong to one community, and those who believe so do not understand the very messenger.
Hats off on the double standards of yours when you say that sikh religion was a man made religion and Islam is based directly on the message Allah sent to us through his prophet. Guru Sahib says -
ਆਿਗਆ ਭਈ ਅਕਾਲ ਕੀ ਤਬੇ ਚਲਾਇਓ ਪੰਥ
ਸਬ ਿਸਖਨ ਕੋ ਹੁਕਮ ਹੈ ਗੁਰੂ ਮਾਿਨਓ ਗਰੰਥ
Aagya Bhai Akaal Ki Tabe Chalaayo Panth
Sab Sikkhan Ko Hukam Hai Guru Maanyo Granth.
(It was by the order of Lord Himself that the new Panth of Gurmat was fashioned. All Sikhs are ordered to believe in Sri Guru Granth Sahib as their Guru.)
When Gabriel brought the message of Allah to Mohd. Sahib, his wife Beghum Khadija (sorry, if I misspelled the name) said these words can not be of Mohd. Sahib. At this Mohd. Sahib had replied that it was true, he had been silent, and now Allah was speaking through him.
I believe in this story cent percent just like I believe those related to Guru Sahibaan, but your rejection to believe Guru Sahib’s being His messenger shows your irrationality. One should have a general sense to respect the prophets, and to men of god.
Guru Sahib had not visited Makka out of curiosity, nor because he followed Islam. It was rather because he wanted all humans to improve upon themselves and leave false practices. The first word that he uttered after realization was - ‘Na Ko Hindu Na Musalmaan’ that means there was no Hindu no Musalmaan. Allah has no religion. He loves all irrespective of our colour and creed.
Lol… Ignorance makes us think that we own a language. Of course, a prophet speaks in a language which is prevelant in that particular area. That made Mohd. Sahib speak in Arabic. And, there is no concept of Hajj in Sikhi. To us going to a place related to Guru sahibaan is to relate ourselves with our history and it changes the mindset of a man when one experiences a feeling of love and devotion toward the Guru at a place where the shabads of the Guru were first heard. Why only ‘rab’, there are words like Khasam, Parmatama, Allah, Parmanand, Ram, Gopal, Gobind, Beethal, and n number of Waheguru’s name used in Sri Guru Granth Sahib. Guru sahibaan have addressed Waheguru ji with different names based on His attributes. If Guru sahib is relating humans as Jeev-Istri, he calls Wahguru ji Khasam, when he wants to address the Allah for giving everything for growth of everyone and everything on earth, he calls Waheguru ji Gopal (he who looks after the all universes). And Lol… :), Nankana Sahib is the place where Guru Sahib was born. Are you saying that Guru Sahib went to A PILGRIMAGE TO HIS BIRTHPLACE??? 
Guru Sahib accompanied Bhai Sahib Mardana ji to Qaaba. And if you can imagine that Prophet Mohammed Sahib would have told a lie for entering a place, then I am not surprised on your saying ‘they must have been lying’ about Guru Sahib. And, Guru Sahib did not go to Mecca for the reason you guys go. He went there to stop you guys from believing in purity of a particular place over every other place. Sain Miyan Mir, a Muslim saint and a renowned Fakir had started reading Namaaz in the direction of Harmandir Sahib in Sri Amritsar instead of towards West. Only one out of crores is trader of truth, all others just stay in Khushfehmi of being believers. Guru Sahib had a courage to call a spade a spade when he names Baabar as Jaabar and when he says, “Raaje Sheeh Mukaddam Kutte”.
Lol… a new thing to me! 
About Islam, Guru Sahib says -
ਿਮਹਰ ਮਸੀਿਤ ਿਸਦਕੁ ਹਕੁ ਹਲਾਲੁ ਕੁਰਾਣੁ
ਸਰਮ ਸੁੰਨਿਤ ਸੀਲੁ ਰੋਜਾ ਹੋਹੁ ਮੁਸਲਮਾਣ
ੁMehar Maseet Sidak Haq Halaal Kuraan. Saram Sunnat Seel Roja Hoho Musalmaan.
(Let mercy be your mosque, faith your prayer-mat, and honest living your Koran. Make modesty your circumcision, and good conduct your fast. In this way, you shall be a true Muslim.)
Guru ji is the sarabkalasampooran human being who told not others to convert to his path but to follow one’s own path with all devotion and truth without attaching oneself to meaningless rituals.
Guru sahib clearly says -
ਨਾ ਹਮ ਿਹੰਦੂ ਨ ਮੁਸਲਮਾਨ
ਅਲਹ ਰਾਮ ਕੇ ਿਪੰਡੁ ਪਰਾਨ
Na Hum Hindu Na Musalmaan, Allah Raam Ke Pind Praan.
(I am not a Hindu, nor am I a Muslim. My body and breath of life belong to Allah - to Raam - the God of both.)
It was not greatness of Islam by the way that converted maximum of Hindus into Islam, but was fear of Mughal sword, and of death to which coward Hindus succumbed. But when Guru Sahib showed a way to all the downtrodden people when he said -
ਜਉ ਤਉ ਪਰੇਮ ਖੇਲਣ ਕਾ ਚਾਉ
ਿਸਰੁ ਧਿਰ ਤਲੀ ਗਲੀ ਮੇਰੀ ਆਉ
Jo Tau Prem Khelan Ka Chaao, Sir Dhar Tali Gali Meri Aao.
(If you desire to play this game of love with Me, then step onto My Path with your head in hand.)
Lol… You have chosen a name Insaaniat.
Have you seen a video of Guru Nanak himself? Which company had invented the video cameras in 15th century, I am keen to know? Guru sahib’s pictures are imagination of various painters, Hindus, Muslims and Sikhs. And also, Sikhs do not believe in pictures/idols. Body is not our Guru. Our Guru is Shabad, the eternal Naad.
Brother, my fellow-being, instead of proving such false things, just prove yourself to the Allah that you are a true Muslim. Guru Granth Sahib tells enough of Guru Sahib to those who want to learn. A Sikh according to Guru Nanak is the one who is constant learner of the true path. Now this true path can not be shown to anyone except by the True Guru. The True Guru is Sri Guru Granth Sahib as all the baani/shabads in it are written by the Messenger of God himself. Quraan is not written by Mohd. Sahib. It was written much later than the actual time when Mohd. Sahib received the message from God. Who knows what unauthentic things are added for personal gains of those who wrote it? Similarly, the contents of Bible have also been modified more than twice, and it was not written by the Christ. Geeta was also not written by Krishna. Vedas have no origin known. Ramayana and Mahabharata are known to be myths. It is not a matter of winning or losing. It is a matter of soul, and this is the chance that we have gained to come out of the birth-cycle. Logically, one should follow the Complete Guru instead of the incomplete or the unauthentic.
Yea, Guru Sahib’s first teacher was a Muslim Maulvi, but to teach him Persian. Guru Sahib’s only Murshad is Akal Purkh (Allah). Nanak’s father’s strong desire was that Nanak should learn something, which will be useful for earning his livelihood.
Next day, Mehta Kalu consulted Rae Bular. He advised that Nanak should be sent to some Mulla or Maulvi to learn Pharsi, as it was the language of the government. Knowledge of Pharsi was necessary for government service. He told that he would employ Nanak as Munshi (clerk), once Nanak learned Pharsi. Rae Bular’s father had recently become Muslim. He had respect for Hindu culture and sages, Rae Bular was Jagirdar of Talwandi and Mehta Kalu was his patwari, who was responsible for collecting revenue, looking after accounts etc.
As advised by Rae Bular, Nanak’s training commenced at Mullah’s house, on an auspicious day. He began teaching Nanak with much love, the latter being the son of Rae Bular’s munshi. Mullah asked him one day why he was not reading. Nanak composed a verse. Its gist was thus: Death is inevitable. So it is essential to fear the Creator of the universe; Parmatma. For that, His Name has to be remembered. My thoughts revolve around that. Kazi Sahib, you too remember His name and know Him. However deeply a man learns, he has to depart when his breath stops. But those who repeat the Name become immortal. Having known these thoughts, Mullah said to Nanak’s father, “Nanak could not be taught like others. He is talking philosophy.” The Ustad bowed to Nanak and became his disciple. He went to Raebular and Mehta Kalu and told that Nanak was a divine man.
Please let me know where Guru Sahib said this. Lol… Lol… 
Yes, decision rests on us only but why are you propagating false things?
Just like what that Sardar ji told you looked rubbish to you, it could look rubbish to sardar jis as well when you say that all the souls will seek their bodies on the doomsday and Allah will listen to all, and those who do not remember Quraan by heart shall be thrown in the fire of hell and so on. Never say one’s belief as rubbish. It hurts all equally. Who gives us right to speak ill of the path we know not ABC of. And yes, Kaafir, this is perhaps the most favourite word of you guys. I shall like to know its meaning. To me, a kaafir is anyone who does not believe in Waheguru ji, and in the equality of all humans irrespective of their colour and creed, has a complex of inferiority under or of superiority over any other religion. To me, Kaafir is anyone who does not have a Murshad. Guru Sahib says -
ਸਿਤਗੁਰ ਬਾਝਹੁ ਗੁਰੁ ਨਹੀ ਕੋਈ ਿਨਗੁਰੇ ਕਾ ਹੈ ਨਾਉ ਬੁਰਾ
Satgur Baajho Gur Nahin Koi Nigure Ka Hai Naao Bura.
(Without the True Guru, there is no Guru at all; one who is without a Guru has a bad reputation.)
I smell presence of superiority complex in your post, man. You call us non-believers. Those who say to Waheguru ji -
ਤੇਰਾ ਕੀਆ ਮੀਠਾ ਲਾਗੈ
ਹਿਰ ਨਾਮੁ ਪਦਾਰਥੁ ਨਾਨਕੁ ਮਾਗੈ
Tera Keeya Meetha Laagey. Har Naam Padaarath Nanak Maangay.
(Your actions seem so sweet to me. Nanak begs for the treasure of the Naam, the Name of the Lord.)
What an irrational thought your religion preaches, if it does!!! The one who is smiling while getting all joints cut (Bhai Mani Singh ji) is a non-believer for your religion, and the one who is cutting the joints is a believer. One who is killing his own brothers and putting his father in gaol is still a believer, and the one who is giving his life to save someone else’s religion (Guru Tegh Bahadar Sahib) is a non-believer. May Allah bless you all!!! Mohammed Sahib could never have said such atrocities to be done towards humans. This is what I say when I call that Kuraan is not in its original form. Its contents have been contaminated.
Enough for the day.
Dust of the feet of those living life in accordance with Gurmat,
Parminder Singh