Who says making funny videos about the Word of God/Christianity isn't sinful?
If you're going to try to imply that it is, the burden of proof is on you to do so in a far more conclusive manner than just tossing out the implication.
Prove that using humor to teach Christian, biblical principles is, in any sense, sin. Use examples, and include scriptural backup. Your argument must be constructed in such a way that your readers can easily follow your reasoning from first principles found in scriture all the way through to the practical application of the referenced texts that qualifies the use of humor as sin when the object of said humor is a) The Word of God (bible), or b) Christianity.
Since your research paper will be a bit more exhaustive than can be reasonably contained within a single post, feel free to post it as a Vanity piece, so that it will have it's own thread. Be sure to ping those of us who have participated in the discussion on this thread so that we may review your reasoned position and know from what great wisdom it arises.