As Youngsters what does one interpret ‘religion’ to be,

During our education we all study the evolution of man, if that holds true or if considered to hold true, one might also believe in evolution of religions. We can assume that as men moved around the earth and civilizations grew from few people to larger cities, so did their religion; the religions enhanced, progressed and flourished individually. All, having a sole idea of the all mighty addressed by various names; God, Allah and Dev. Their definitions vary but the concept of a power, something phenomenal, sublime and the greatest, to whom one should pay respect, pray to and thank to. The protector of all. None of the religions teach evil and nor do they tolerate any. One can then consider religion to be a way to address their own God or an individual’s sacred path to reach out to God.
I have never read any religious books, but yet believe in God strongly. I think one can define religion for oneself; it is a belief one sets and lives a better life with the help of it. It elevates him and makes him stronger and confident to do the right and to fight the wrong.
A new born child never understands religion or is not born with pre philosophy of his religion. He understands it as he grows. What does this imply?
If my philosophy holds true or even near to the truth then why do we fight over religion or condemn each others beliefs and makes issues out of minor things. We are educated and yet the same like the other lot!

Prarthana (PJ)