Do I have free will? A Christian would say yes but if God is omniscient then how can we have free will
when the idea of predestination exists? Are there any other arguments for or against the validity of
such a question?
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According to the apophatic theology, God is not omniscient nor non-omniscient. God is beyond
omniscience which is merely a human concept. God is beyond concepts.
Predestination is also a mere concept.
It seems to me that the God of your hypothesis, as formulated in your question, is a rather
anthropomorphic God.