Nope. Lots of stuff commonly believed by Christians isn’t from the Bible. (Though sometimes they’ll do a lot of mental gymnastics to assert that what they believe is from “the only reasonable interpretation” of the Bible.)
Just a few other things commonly believed by Christians not (or at least only dubiously) from the Bible:
- The seven deadly sins
- The nine circles of hell
- The seven levels of heaven
- Transubstantiation
- The trinity
Transubstantiation is kind of in the Bible. Matthew 26:26-28
While they were eating, Jesus took bread, and when he had given thanks, he broke it and gave it to his disciples, saying, “Take and eat; this is my body.”
Then he took a cup, and when he had given thanks, he gave it to them, saying, “Drink from it, all of you. This is my blood of the[a] covenant, which is poured out for many for the forgiveness of sins.
The discussion of transubstantiation is just how literal “my body/blood” is.