Man is not logical and his intellectual history is a record of mental reserves and compromises. He hangs on to what he can in his old beliefs even when he is compelled to surrender their logical basis.
This is the beauty of the Qur'an: it asks you to reflect and reason and not to worship the sun or moon but the One who has created everything. The Qur'an asks man to reflect upon the sun and moon and God's creation in general.