If, at the end, he continued to reject Christ as his Lord & Saviour, he will go to hell.
His choice & decision - no one else’s.
You have no idea what he did “at the end.” Personally, I don’t care one way or the other. He was a brilliant writer and a fighter for many good causes (as well as ones I disagreed with).
His last column in VF was about how he no longer believed the aphorism “that which doesn’t kill me makes me stronger.” If he backed off that one, he may very well have backed off his views on God and eternity.
But as I said, I don’t care one way or the other. RIP, Christopher.