what happens if you’re wrong?
If your religion isn’t really the one true religion and you end up just a rotting carcass in the ground. Or what if there is a god but your religion wasn’t the one true religion, or you didn’t meet up to his standards and you burn in hell for eternity? What’s the point of worshiping god all your life if the probability of you actually getting into heaven is close to none, and that’s just if there actually is one.
I say, make your life here the best it possibly can. You should live as if there is no god, no afterlife, and this is the only life you have. Do good things, but don’t be afraid to live a little. If there is a just god, then he will look at your life and see that it was good and he will let you have a happy afterlife. If there is an unjust god, then there wouldn’t have been any point in worshiping him in the first place, and you can just be happy that you enjoyed your time on earth. And if there is no god and no afterlife, and the life you have now is the only one you have, then you lived the way you should have.