Why is the 13 constellation missing a constellation?

Originally there was a 13 constellation, and there was a Ophiuchus missing. Ophiuchus disappeared because Ophiuchus is the thirteenth constellation, and many westerners believe in Christianity. According to Christian classics, the founder of this religion, Jesus, was betrayed by his thirteenth disciple and finally killed. In the west, the number 13 is widely regarded as an ominous symbol. No wonder westerners have some taboos about Ophiuchus, which is called thirteen constellations.