Yes, there is one thing.
Blood sacrifice.
In the Old Testament, it lays out that when god is upset with you or to gain his favor, you need to kill a dove, or an ox, or in rare cases. . . Your own daughter. It's the Iron Age traditions of blood magic. . . Killing animals or people to gain favor or penance of a god.
Christians see Jesus as the ultimate blood sacrifice, a god taking human form, sacrificing himself to himself, to give humans an opportunity to gain its favor or absolve themselves of the sinful behavior that separate themselves from god.
For a Christian, the Old Testament establishes this blood sacrifice idea as an effective practice. . . And killing Jesus was infinitely more effective because it's the last blood sacrifice they needed to get god to chill on his anger and desire to punish everybody for . . . I dunno, masturbating or whatever.