Dude, the church my family followed was similar. I was asked to sign a document pledging I would do all sorts of things, like raise the kid in the religion if their parents died, also to live a "moral sex life" and resist the evils of gay culture and drugs. I didn't sign and saw it as an act of honesty and respect to explain I couldn't fulfill their request.

If you think so little of other people's religious beliefs that you would lie to become a godparent, you do you.