Final answer:
Galileo's teachings were considered heretical because they contradicted religious beliefs in a geocentric model of the universe.
Step-by-step explanation:
According to Galileo, some people think his teachings are heretical because it contradicted religious beliefs.
In Roman Catholic Italy, the Church authorities promoted the geocentric model of the universe which stated that Earth was the center of creation. However, Galileo's adoption of the heliocentric model of the solar system challenged this belief and was seen as a contradiction to religious teachings.