A few things:
(1) Stop reading books that obviously make you question your faith, or at least lead you to turn to others to help answer objections you weren’t prepared to read. The fact that there are scholars who have no supernatural faith doesn’t imply you need to analyze all of their arguments in minute detail just to make sure they’re not onto something. This is especially true if it is beyond your state of life to be looking into such things, i.e., if you’re not a scholar yourself. These books are purposely written with the manifest purpose of sowing doubt and undermining Christianity. Leave them alone, and don’t rely on presumption or on pride by thinking you’re exempt from protecting your faith. If you’re just itching to find out what they’re saying, this is evidence of the vice of curiosity, which is an inordinate desire for useless or profane knowledge.
(2) If you’d like a 5 1/2 hour, popular-level audio treatment of this and other related topics, check out Brant Pitre’s MP3s here:
store.catholicproductions.com/products/jesus-and-the-end-times-a-catholic-view-of-the-last-days?variant=16683286593. Dr. Pitre specifically deals with this blasphemous “failed apocalyptic prophet” garbage in, I think, the very first talk.