ecco: The real reason that most people believe in
their gods is because their parents believed in those/that gods/god. If you were born in India to Hindu parents, you would be extolling the virtues of Shiva. If you were born in Iran to Shia parents, you would be extolling the virtues of Allah.
Of course there are exceptions. Do you want to try to deny that most people end up in their parents' religious sect? Perhaps you want to try to pretend that most Irish Catholics don't have Irish Catholic parents. Perhaps you want to try to pretend that most Sunnis don't have Sunni parents.
Since you want to be picky, I'll add a word to my previous assertion:
If you were born in India to Hindu parents, you would probably be extolling the virtues of Shiva. If you were born in Iran to Shia parents, you would be probably extolling the virtues of Allah.
Is that better?