Religion is regarded by the common people as true, by the wise as false, and by rulers as useful.
It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring.

I distrust those people who know so well what God wants them to do, because I notice it always coincides with their own desires.
if there is a god, he sure hates people
If there is a God, he is a malign thug.
I am satisfied with the mystery of the eternity of life.
The God of the Old testament is arguably the most unpleasant character in all fiction.
There are those who hate Christianity and call their hatred an all-embracing love for all religions.

With or without religion, you would have good people doing good things and evil people doing evil things. But for good people to do evil things, that takes religion.
The fact that a believer is happier than a skeptic is no more to the point than the fact that a drunken man is happier than a sober one.
Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear.
If there is a God, atheism must seem to Him as less of an insult than religion.
You shall know the truth, and the truth shall make you mad.