The god of Islam says it’s morally necessary to lie. The Christian God forbids lying. Therefore they cannot be the same.
God forbids murder, not killing.
The definition of God as accepted by Christians is not variable.
God created the universe, sustains it as we speak, and he gives us life. His authority to tell us what’s right and what’s wrong is immeasurable.
Another person telling you or me what they think is right or wrong, or a group of people telling us—this is still subjective.
Islam forbids lying, not taqiyya. See how that works? The OT God and Allah both have separate rules for how you deal with people inside the community, and how you deal with outsiders. I assure you, modern day Islam is closer to Deuteronomy than anything you're living. Now, if you're saying that the OT is wrong about what God is "really" like, I won't argue. I've found that everyone who believes in God is also such an expert as to His innermost self that they are practically soulmates. It's almost as if every believer has his very own God, and it's astonishingly compatible with their own precious self.