Not all comic books are Christian. Some might touch on Christian values or elements, but it's not a defining characteristic for the entire genre. Different comics appeal to various audiences and cover diverse topics, not necessarily centered around Christianity.
Comic Con is a completely family-friendly and mainstream event focused on comics, movies, TV shows, and related stuff. It has nothing to do with porn. It's a celebration of creativity and fandom.
Definitely. The series takes inspiration from the comic and builds upon its themes and characters. However, there might be some adaptations and creative changes made to fit the medium of television.
Sorry, I don't know. There might not be any publicly known relationship. Maybe they are from completely different fields or have no direct link at all.