Project 2025 is what will cost Trump the election.
Trump can claim all he wants that he doesn't know about Project 2025 but make no mistake about it, he's lying his ass off. He knows what everyone else knows: it's a Christian Nationalist agenda.
The thing is, Project 2025 is becoming mainstream now. More and more people are finding out about it. The republicans are trying to keep it under wraps (notice nobody mentioned it at the RNC) but the truth about it is already out there and it is spreading FAST. The more people find out about Project 2025, the more that centrists and independents will see how republicans and the Christian-right and Trump are batshit insane.
Republicans basically shot themselves in the foot by even coming up with Project 2025 in the first place. They screwed themselves. If they had never made Project 2025 they might've had a shot at winning this election, but not anymore. Since Biden has stepped out of the race, Trump is now the "old and incoherent" candidate and now the only thing republicans have on Kamala Harris is "she's weird" and "she has a strange cackle" and that's about it. They are fucked and they know it.