Religion is a No Option Column in ones birth Certificate

In the aftermath of Mumbai Carnegie, as I sit back and listen to the fundamentalists, atheist and all religious leaders, I take a minute and think for myself as to what my religion is and why I am in this religion just to realise that I had absolutely no choice of a religion. I was born into this religion. So why fight for it, or fight against others religion. I do not understand the dynamics of such religious sentiments.