It magnifies self and makes the heavens small. Pride puts our circumstance between us and God, but faith puts God between us and our circumstances. And it takes more than just belief. Naaman believed the slave girl. But he had faith in God.
Faith is a much better word.
Faith is belief plus action. Naaman acted on what he believed and even though he grumbled, he eventually humbled himself and was healed. Naaman made the trip to Israel on the word of his slave girl, that is belief. Faith meant getting wet in the Jordan River. Once Naaman got over the pride of his position and power, he was able to be held by his faith and made well and whole.