This is totally new to him, so I can see where this is awkward for him. However, he is 14. My son would be required to attend services with us. When he gets older, he is free to make his own decisions. I understand he's made up his mind that he's an atheist. Just remember, God is more than just religion, it's about relationship. God has to real to him. I can't imagine how difficult this is and not sure if what I would do would be helpful to you. (((((HUGS))))))))