So, if anyone could point to any actual proof that Trump has or had anything at all to do with Project 2025

Democrats would believe Trump wrote Mein Kampf if the TV told them he did.

Their proof is "He's Trump, of course he does, that's all the proof you need!"

I haven't either. The full .pdf is ~900 pages. But claims like making Christianity the *official* religion of the US, a country expressly founded on *no* official religion and even having it written into the Constitution, or that Heritage Foundation "sponsors" (how?) judge nominees, are too ridiculous to be credible.
https://www.project2025.org/policy/

I dunno, I could see making Christianity America's official religion being there, especially in response to how supportive leftists seem to be of enemy countries that have Islam and sharia law as their official religion. (Just look at the left-wing antisemitism and support for Hamas.)