There is no "THE Antichrist" there are only antichrists, plural, normal not supernatural people and organizations that behave in a notably non-christlike way, and both parties here seem to qualify easily.
Funnily enough, the bible agrees, or at least John's epistles.
People who fantasize themselves as the antichrist (like Thiel, he's not very good at hiding it) ought to remember that antichrists being a dime a dozen is quite biblical.
I take it you would like to compare against the whole of the Vatican's existence, and not against just the whole of Peter Thiel's adulthood?
That's not really a reasonable argument, because Thiel hasn't had the power of the Vatican (especially the power the vatican used to have), but what he's done with his power so far is much more concerning to me that what the vatican has done in the last 4 years, yes.
I think we both agree that the catholic church has received an unwarranted elevation and presumption of beneficence in media, but the distinction I'm drawing is that a billionaire who's toiling in American politics and claiming Greta Thunburg could be the antichrist is actively concerning.
Agreed, it would be exceptionally hard to choose just 1 (or even 10) right now.