Here's how this works out.
If God is determining everything--not only actions, but also the beliefs we hold--then we have a significant problem with being able to determine whether the beliefs we hold are true.
If God is determining everything, and someone believes that God is determining everything, then that person's belief conforms to reality. No problem so far.
If God is determining everything, yet someone believes that God does not meticulously determine all things, then that person holds a false belief. However, that false belief was itself determined by God. Additionally, the false beliefs of the Buddhist, Muslim, Sikh, atheist, and Satanist are also held by them because God so determined things.
