I've always thought of it this way. If Atheists are right, and there is no God, then you have nothing to fear. Let Christians believe in God if they want. What's the worst that could happen?. But, if Christians are right, and there is a God out there, and we are sinners who need to be saved by grace, the anyone who is not a Christian had better be thinking about that. True Christians don't try to force their religion on you. Most are genuinely worried about you. That's why we try to prove there is a God and that you need to be saved.
This is just my opinion. I'm not trying to start an argument.