Complex sentence: The God-Idea as taught in our sacred Scripture as consecrating the Jewish people to be its priests, and was grounded on a wholly theistic understanding though the term "God-idea" was excoriated by outside critics.
Split into simpler sentences: The God-Idea as taught in our sacred Scripture as consecrating the Jewish people to be its priests. It was grounded on a wholly theistic understanding, though the term "God-idea" was excoriated by outside critics.