Is one considered an infidel and an apostate if they write on social media: "It was the Egyptian civilization that invented the idea of God, or the existence of God," intending to disparage Egyptian civilization, not to deny the existence of God?

One who writes the phrase "Pharaonic civilization is an infidel civilization" does not commit an act of disbelief (kufr), because their intention is to condemn and denounce the adoption of deities besides Allah. The criterion for declaring someone a disbeliever lies in intentions, not merely in words.