I look at everything I do onstage from the perspective of those I invite to watch it. If anything I do onstage causes anyone to question my witness, my faith, or my morals - that's when I do not do the part. You have to look at things not just from the perspective of how you personally feel about it, but also from the perspective of how those you are influencing will feel about it. What do you say when someone sees in your bio that you are a Christian, but the text of the play is full of vulgar language, nudity, sex, adult-themed topics, etc.? What will your witness say to them then? Will they be open to discussion with you at that point, or see you as yet another Christian hypocrite who talks the talk, but doesn't walk the walk.