Getting back to the original question: 'What if they are right?'
I am becoming an atheist so the way I see it there are 4 main possibilities.
Option 1: They are wrong and I am an atheist. Result: I will live a normal life, meet nice friends who don't care about my religion, maybe have exiting adventures, watch the movies I like, spend Sundays Thursdays and Tuesdays doing something fun or usefull, have sex, play Final Fantasy, donate blood just for the heck of it, and then die, hopefully happy. That's it.
Option 2: They are right and I am an atheist. Result: Result: I will live a normal life, meet nice friends who don't care about my religion, maybe have exiting adventures, watch the movies I like, spend Sundays Thursdays and Tuesdays doing something fun or usefull, have sex, play Final Fantasy, donate blood just for the heck of it, and then die, hopefully happy. That's it. OR I will live a normal life for a while and then die in armageddon, if it happens to come in my lifetime. Which is very unlikly.
Option 3: They are right and I am a witness. Result: I will live a horrible life untill the end. Then I will live in paradise under the direction of a god who just killed my grandparents. I will live forever gardening and enjoying nature... No TV or video games. No cars, computers, meat, soda, varying ideas, or pretty much anything a modern human enjoys.
4: They are wrong and I am a witness. Result: I will live a horrible life, trying to convert unbelievers, every single day wondering when the end will come, getting old, or worse yet dying from an accident because I can't take blood. Laying in a hospital bed in misery thinking of myself in paradise, instead of my family who will probably have turned apostate years ago, and I will have shunned for years. Then I'll die and the ones who knew me won't even mourn my death because they mistakenly believe they'll see me again... Plus I was a boring human anyway.
So in conclusion... I am completely convinced they are wrong... But even if they're right I don't want any part of it.