To get back to (semi-) serious here...
Getting any actor, especially an actor with some talent, to commit to a project is hard enough; limiting yourself to "Christians" is really going to restrict your talent pool (and may even be discriminatory in some jurisdictions). Even if your project is faith based, good actors who don't share that faith should be able to project the attitude you require. However, you also have to be on your best behavior. By asking specifically for "Christians" and therefor promoting yourself as one you are now a visible representative of your beliefs. So if you, even once, do anything contrary to your espoused beliefs in the eyes of those working with you you will have denigrated your belief structure and yourself.