this reads like a hot trollin mess, but just in the event you are sincere, here is my advice:

I have said in this forum many times that I have atheist neighbors and we are very close, we have talked in depth about this, they understand me and I understand them and I love them like family and they love me the same. We play and fight like family as they say. We share cook outs, basketball and our kids are friends. We have no conditions or coins placed on our friendships, we respect each others belief and enjoy each other daily. (They are mad now cause my team won the superbowl. ha, ha!)

The best thing to do is to talk with them, and find out why they believe as they do, plant the seed and let God do the harvesting. The choice is theirs. We have agreed to disagree about what we believe and why. The best thing you can do is Pray about this friend and ask God to bring Him to salvation before he leaves the world.

Set good examples, be fair and wise in all judgements around the person. Tell them your concern when you talk and when you are done leave it there.

We cannot choose for others, and if we could they may not like the choice we would make. Continue to love your neighbor as yourself and be a good and respectful neighbor as you are doing now. God is in control and some are given the spirit of slumber.

Take it to God in prayer and leave it there.