Wouldn't you rather believe and have the hope of eternity? If it's not real, then oh well, you lived a good life. If it is real, then you'd be so glad you were a part of it.

I've recently learned this argument is called Pascal's Wager. I reject it for many reasons, but the main 2 are these:
What if one picks the wrong god in which to believe? And since I believe that religion is harmful, devoting one's life to a god is more than a waste of one's precious life, it can hurt one's self and a lot of others.