Re: Too Extreme
Brother 
.
Thanks for finding the post helpful.
Anyhow, I am sorry that you feel I did not covered what you asked, though I believe I understood your question and in my post I tried to answer what you asked. Actually, I felt in your question you asked about something indirectly, and my post indirectly tried to answer that.
Now, since you wrote that you did not get the answer … let me clear what I thought you asked, and what I wanted to say about it, in different words.
I believe your question was … ‘suppose if someone starts an act considering it to be good deed (or ibadah) that is not covered in Quran or hadith, and then this act of good deed (of ibadah) becomes so popular that many starts doing that regularly, so is that right or wrong?’
I might be wrong (again) in guessing your question, but that is what I understood and I did give answer to that in my previous posts … though indirectly.
So, let me give the answer again … more directly (obviously, with some explanations to back the answer).
In Islam, what is part of deen (in terms of Ibadah) are what is fard. They are:
Recitation of ‘Kalma-e-Shahadah’
Prayers 5 times a day
Fasting in Ramadhan
Zakat (what is due)
Haj (if one can afford, once in life)
Addition to above mentioned ‘fard’ or any other ibadah performed as ‘fard’ is bidah and thus is unacceptable.
Addition to Ibadah (bidah):
1: Doing fard Salaat more than 5 times a day.
2: Fasting as ‘fard fast’ outside Ramadhan.
3: considering zakat more than clearly specified.
4: Performing Haj more than once and considering them all as fard.
5: Any other ‘act of ibadah’ performed considering that as ‘fard’, what is not fard.
All above ‘ibadah’ is bidah that is unacceptable and would lead a person to hell (I explained in my past post … why it is unacceptable?).
Denial of any ‘fard ibadah’ as obligation is kufr, and that would also take a person to hell (denial … not … ‘not performing with believe of its obligation’).
One should know that if one performs all ‘fard’ ibadah (no more, no less), than that person fulfils all required ‘ibadah’ in Islam.
[Actually, there is hadith that a man asked Prophet (SAW) that if he performs obligatory prayers, fast in Ramadhan, accept what is halal and reject what is haram, then will he enter Paradise … and got affirmative answer.
Hadith mentions obligatory prayers and fasting … because other two ibadah, hajj and Zakat, is conditional on fulfilling certain financial conditions (so they are not obligatory on all … though believing on them as ‘fard’ if condition is fulfilled, is obligatory on all) … and ‘Kalma-e-Shahadah gets fulfilled in prayers. This shows that Ibadah in Islam is only ‘fard’.]
Now coming to your question?
‘suppose if someone starts an act considering it to be good deed (or ibadah) that is not covered in Quran or hadith, and then this act of good deed (or ibadah) becomes so popular that many starts doing that regularly, so is that right or wrong?’
Actually, one can do any number of ibadah or good deeds (or deed a person consider as good), as long as that deed do not harms other nor it is performed as ‘fard’, than it makes no difference to Islam, neither it carries any sin. If such deed becomes popular, and many start performing them without considering them ‘fard’, then also there is no harm.
[If deed is to do with Islam, especially ibadah where a person is expecting rewards from Allah, then considering them ‘fard’ means considering that Allah has made that deed fard or person himself deciding a deed to be ‘fard’. Both cases can take a person to hell, because only Allah can make an act fard, and that would be ‘bohtan’ on Allah or making oneself equal to Allah by making a deed fard on oneself.]
Actually, Prophet (SAW) answered this question with his practice. For instance, he used to do ibadah that were not ‘fard’, and we perform them as Sunnah. Sunnah or Nafil ibadahs are not asked by Allah to perform neither Allah would ask about them on judgment day if we don’t, as they are not obligated part of Islam … but we perform them to gain rewards and expect to get rewards for them.
Obviously, no one can be compared with Prophet (SAW), but what Prophet (SAW) did is shown to us Muslims, that people can do ibadah or good deeds outside ‘fard’ that others can follow too (if they like to), and people can expect rewards from these ibadah or good deeds.
Actually, one can do whatever one likes that one thinks as ‘good deed’ outside ‘fard’ or outside ‘recorded deed in any past Islamic source’, and could expect rewards from them … and other Muslims could also follow as long as they do not consider the act as ‘fard’.