Is There a Difference Between Forgeries and Claims?

If we cannot securely attribute the gospels to a specific person, is that difficulty? Or if we're looking at pseudonymous or forgeries, which obviously are wrongly attributed deliberately or otherwise. Does that falsehood then impact the truth of the writing that we's looking at, either historical or ethical moral truth? This is a very, it's a very difficult question that I don't think people know how to wrestle with it usually.