If conversion to Christianity was a legal contract what would be in the small print?

Salesmen are notorious for getting you to sign contracts for some glossily promoted product but then saying don't worry about the small print, its just standard legal stuff, then when you have a problem they claim well you signed the form. Conversion to Christianity can be like the slick sales experience but the Bible or the received principles of faith could be the legal small print of the contract. If you were to advise someone on what some of the more onerous and hidden parts of the small print entailed what would you highlight as things to look out for? Like saying do you really understand what you are getting your self into?