If many of your friends are believers, you should reassure them that you’re a believer too, just some things are more believable than others.
Watch Star Wars, and just think that all those who idolized the series will probably go to Hell. May the force be with you!
Remember there’s a difference between knowledge and belief: we share a belief that there is no God, but we don’t know for a fact that the dude ain’t real (AIR).
Remind believers what they are: believers, and what they’re not: knowers.
There are many myths we ought to stop believing in, like karma, reincarnation, free meals, the invisible hand, taxation without representation, etc.
Assume that deep down, all believers with working brains have doubts about their beliefs.