Answer:
The Catholic Church objected Galileo's theories so strongly because it went against some things they were teaching. The Catholic Church taught that the earth was the center of the universe, while Galileo theorized that the world was actually heliocentric, and the sun was the center of the universe, while the planets revolved around it. If Galileo was correct about this, many other people would start questioning the Catholic Church and going against them. The Catholic Church wanted to keep it's power and authority and objected Galileo's theories strongly.