Halal is very different from Kosher. CoolDude gave us a Quranic Ayah earlier and I would like to edit that:
Quran 5:5 5:5 This day are (all) things good and pure made lawful unto you. The food of the People of the Book is lawful unto you and yours is lawful unto them. (Lawful unto you in marriage) are (not only) chaste women who are believers, but chaste women among the People of the Book, revealed before your time,- when ye give them their due dowers, and desire chastity, not lewdness, nor secret intrigues if any one rejects faith, fruitless is his work, and in the Hereafter he will be in the ranks of those who have lost (all spiritual good).
Here Allah clearly says, Halal things are for the people of the Book. Allah did not said for (Jews or Christians) but He said for the people of the Book. Who are the people of the Book? Anyone who believes in Allah's Books and follows it is a Muslim not a Jew or Christian. Islam is not the new religion. It is the same religion of Adam to Mohammad(PBHT). If someone does not follow the Book or Allah and call him/her self a Jew or a Christian is he or she really a person of the Book? No!!! Allah(S.W.T.) said People of the Book not the once who do not follow the Book.
If you go and read the Bible, which we shouldn't but just for a reference you will find that even though the Bible has changed many times it still holds little Truth. It forbids eating of swine. It tells people to believe in One and Only God. It teaches the correct way to bow to Lord. It teaches you to believe in all the Prophets(PBUT), it tells you the same message of Islam. Do people really follow the Bible? No!!! Neither do Jews nor do Christians so are they really the people of the Book? No!!! It is forbidden for you to eat anything from a Jews or Christians house that is not Halal(lawful). It is even a greater sin to give false information. The words of Holy Quran are not by accident. Each and every single word has a meaning itself in Quran. When Allah said in Quran 5:5 "People of the Book" He did not say Jews or Christians. People added this in there. Islam is the universal religion. What is Halal in Islam is lawful for every human being and jinns no matter if they are Hindu, Christians, Jews, etc. But what they eat doesn't have to be Halal for us because they would eat anything that they will not what Allah wills. When Muslim say "La illa-Ha el-Allah" we accept that their is One God and His name is Allah and we enter Islam. Islam means Submission. When anyone enter Islam he/she accept that now he is going to life a life in a way that Allah wills not what he/she will. When we say "Mohammadur Rasool-lullah" we accept that we are Muslims who are from the followers of Mohammad(S.A.W.)
Also Bhola#1 you said if a Muslim pray his/her prayers and eats Haram, he/she is better than the one who eats Halal and does not pray.
You are absolutely wrong on that. I don't know the exact Ayah in Quran but if you would like let me know and I will search for it and give it to you, Insha-Allah. In Quran Allah says "Prayers protect you from doing evil deeds" now if a Muslim prays him/her prayer and then go and commit evil deeds such as eat Haram is he really praying his/her Salat? No!!! The words of God are just. When Allah said Prayer protect you from doing major sins, this means that if you Truely pray your Prayer you will be protected by the Leave of Allah from committing major sins, eating Haram is a major sin. If a person does that then he is not really praying.
Allah sees our hearts, who is all knowing.
Salat(Namaz) is must for us and we all should pray that. It is the Key to Paradise and Wudu is the Key to Salat. If you have that Key you will be welcomed in the Paradise, as Allah promised in Holy Quran to the True believers. Allah's promises are just.