Knowing every decision every soul will ever make doesn't make Him deterministic... merely Omniscient. He knows everything... including who will or won't pray.
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God knows everything knowable=omniscient. He is not less omniscient because He does not know where Yoda is.
You are assuming eternal now and simple foreknowledge without proof (beg the question). You fail to see that it is problematic to affirm exhaustive definite foreknowledge and libertarian free will (logical contradiction).