Setting aside the question of which if any scriptures might be forgeries, would solid evidence that some NT book is a forgery imply that this book is NOT inspired scripture? If you found out that Slippery Sam from Siam wrote one of the NT books as a practical joke, would you tear that book out of your bible in disgust, or would you be amazed that God can inspire scriptures - even when the writer is not aware that he/she is part of God's plan?