What do you do when you find out one of your favorite friends is Atheist and you don't even have a month to try to change that before he is gone.

My best friend is Christian which just happens to be a great coincidence, but my other friend that is more like my second best friend is atheist and he is moving in a month. I want to help him, but how do you approach someone without it sounding like "Be Christian it will save you" or "Be Christian or you will go to hell and everything you believe is wrong"? I just don't know what to do because I am one of the few Christians left in my school, and everyday more of my classmates and friends are becoming atheist so their is no one that can help, even my best friend doesn't know how to say it without making it sound like a brainwashing society of some sort. I pray everyday, every time I see him, even when I am sleeping I'm having dreams that I will be heaven and he won't be there to instead he will be suffering in Hell which is the worst place to be. If you have any help please post it down in the comments I need everything I can get before the end of school.