Where did the universe come from? Atheistic origin science has no answer.

[Sword of Christ]

These days? Did God change Hell or something?

Better scriptural understanding of what Jesus talked about. All this business here...

...was a medieval man made invention, Paradise Lost and that kind of thing. When in doubt go back to the source. The Islamic hell described in detail in the Quran somewhat more like the classic fiery version. Note that Jesus refers to hell as the "Outer Darkness" you can't have darkness and literal fire so take the burning as metaphorical. He may also have been referring to place were bodies were the bodies of the Jewish dead burned.

If Hell is also a separation from God's more ardent followers, it will be a very nice place to spend eternity.

Those ardent followers could well join you there. Though you may have to put some serious effort into separating yourself from God beyond just not realizing he exists (assuming he does exist and you can realize this). Or perhaps deep within your heathen heart there is some spark of something there you're just not kindling it to the full flame.