Michael didn't account for a few important factors. First, he didn't realize how much fusing Essence into his cells strengthened him. He was still absorbing the Essences of one hundred or more gods and Demi Gods, and one thing was sure: His strength increased with every moment he spent fusing the Essences into him.
Second, Michael didn't realize how much more efficient his body, mind, and soul were when nothing bothered him. He didn't have to hold his emotions back anymore, allowing him to push above and beyond. That was all Michael needed to fuse Essences more efficiently with his cells.
But while those two factors were already terrific enough to push Michael on another pedestal, he was more surprised about Godly Faith's effect and how potent it was after Michael began believing in himself as a whole. He didn't reject anything about himself anymore and accepted everything wholeheartedly.