What two factors made it difficult, at first, for astronomers to choose between the copernican heliocentric model and the ptolemaic geocentric model?

The first law that was generally accepted at that time was Ptolemy's Geocentric model. Where it states that the Earth is standing still and everything it revolving around making it as its center. With these, even Church doctrines are patterned on this. When Heliocentric theory came, they cant comprehend how the Earth could possibly move that everything is staying still (as common sense observation) and they would possibly contradict with Church.