It’s like a movie
The Torah is the first one, and the New Testament is the sequel. Then the Qu’ran comes out and retcons the last one like it never happened. There’s still Jesus, but he’s not the main character any more, and the Messiah hasn’t shown up yet.
Jews like the first movie but ignored the sequels. Christians think you need to watch the first two, but the third one doesn’t count. Muslims think the third one was the best. And Mormons liked the second one so much they started writing fan fiction that doesn’t fit with any of the series canon.
(found bouncing around on the Internet)