islam jesus (pbuh), page-13

Looking at islam from where I sit it appears mohammed observed the power that came with religion so he wandered off and came back with the quran that gave him enduring power for what seems eternity, wasn't the quran added to over the years? and doesn't it say the sun rises from a creek bed and the earth revolves around the moon in the quran?, and since it was written was there one single event that proved that it wasn't just all made up by mohammed?, so much misery from one book made up be a power mad arab, why don't more people challenge its validity.