Final answer:
The Roman Catholic Church was concerned with Galileo's book because it challenged their belief that the Earth was the center of the universe. They saw Galileo's work as a threat to their authority and condemned it as heretical.
Step-by-step explanation:
The Roman Catholic Church was more concerned with Galileo's book because it challenged the Church's widely held belief that the Earth was the center of the universe, as supported by the teachings of Aristotle and Ptolemy. Galileo's work, which supported the heliocentric view proposed by Copernicus, posed a threat to the Church's authority and its interpretation of Scripture. In an effort to assert its authority and maintain the status quo, the Roman Catholic Church condemned Galileo's work as heretical and placed his books on the forbidden list until 1836.