An atheist is the best person to make a Christian film, because he has a more objective approach.
Invite him to your next Bible study, and let him replace whoever’s been teaching you up to this time. Too many Christians mentally genuflect at words of perceived wisdom by people who openly discredit God and His book. And yet these same Christians won’t interpret the words for themselves, because they might get it wrong. Of the two, atheists or Christians (even dithering ones), which group has the Holy Spirit as its guide?