[Cronos]

He didn’t outright ban Christianity. But he worked a lot to undermine it, often from within.

This is also incorrect, very very incorrect -- Julian 361–363 CE) sought to eliminate Christianity completely.

Julian’s most devastating measure was the School Edict of 362 CE, which prohibited Christians from teaching classical Greek literature, rhetoric, and philosophy

This was a massive blow because ever since the days of Justin Martyr, Christian scholars knew BOTH the classics and the Judaic/Christian texts -->btw, tell-it-right, have you read justin Martyr's works? If not, I highly recommend them -- I highly recommend reading his Apologies and his Dialogue with Trypho -- you can find them at -- https://www.newadvent.org/fathers/

anyhoo - so julian argued that because classical texts (like Homer or Virgil) were inherently tied to pagan gods, Christian teachers who ridiculed those gods were hypocrites and lacked integrity. This law effectively forced Christian intellectuals out of the education system. Since mastery of classical texts was required to hold high office or participate in elite Roman society, the law aimed to render future generations of Christians uneducated and unfit for government

He tried to weaponize theological differences to make the Church destroy itself from within.

Julian wrote against the Galileans -- he refused to call them "Christians," choosing the regional term "Galileans" to strip the movement of its universal claims and reduce it to a provincial cult. He routinely mocked Christian scripture as unphilosophical and unrefined.

Julian funded a massive project to rebuild the Jewish Temple in Jerusalem, which had been destroyed by the Romans in 70 AD

He did this specifically to invalidate Jesus's prophecy in the Gospels that "not one stone here will be left on another."

Julian calculated that if the third temple were successfully rebuilt, it would deal a fatal ideological blow to Christian theology. (The project eventually failed due to a sudden, catastrophic earthquake)

[Tell It Right]

I promise you and I think a lot alike on Julian the apostate. Maybe we simply disagree on what I meant by he didn't want to ban Christianity outright, but from within. IMHO, the items you posted are things I knew and weren't banning Christianity outright (by that I mean that Julian didn't put Christian leaders in prison just for preaching Christianity like was done to them in the pre-Constantinople days).

But things like rebuilding the Temple (as you posted) was a means to destroy Christianity from within (as I posted). The same for Julian trying to weaponize theological differences (again, an attack from within).

IMHO it's much like the left does today with God's church. They'll attaboy church leaders who are "inclusive" to homosexuality. Or they'll promote theistic evolution (regardless of what one believes on the age of the earth, saying God did it by using natural selection promotes a modern version of deism in which He doesn't have an intimate relationship with His creation). Or they'll ban you from teaching at universities if you espouse your Christian beliefs (i.e. can't be a professor of biology if you point to characteristics showing God's design).

Even if the left isn't currently outright banning Christianity. They're certainly undermining it in ways similar to Julian. At least that's my humble opinion.