You are assuming that God is needed for for precondition for intelligibility when it is in fact entirely theoretically possible that we simply have larger, more advanced brains than most animals and are therefore able to think more deeply, abstractly and critically. Youre the one that cant PROVE that God is required. Its an unprovable position. If its your opinion that an intelligent being bestowed intelligibility on us, thats fine. You cant turn an opinion into a fact just because it fits your preconstructed world view though.