If God exists, then he is free.
An omniscient being must know exactly what actions he will and will not do in the future.
If one knows that he will do an action, then it is impossible for him not to do it.
Hence, it is impossible for an omniscient being to be free
Therefore, it is impossible for God to exist
An omniscient being must know exactly what actions he will and will not do in the future.
If one knows that he will do an action, then it is impossible for him not to do it.
Hence, it is impossible for an omniscient being to be free
Therefore, it is impossible for God to exist