You don't have to drink an entire vat of poison to prove its foul nature.
The issue posed here is simple: is Islamic faith congruent with the Christian faith? There is no need to quibble over far-flung abstruse points of theology and doctrine to arrive at an answer. Simply find the absolute essence of Christian faith and evaluate it in light of the Koran.
The absolute essence of Christian faith is the belief and confession that Jesus Christ is God manifest in the flesh, that he was put to death on the cross and was resurrected three days later. His actual physical death and ressurection comprise the sign that Jesus Christ himself gave as proof of his divinity, nature, and the purpose of his ministry when he compared himself to Jonah. Deny these things and you deny Jesus Christ.
You may praise Jesus Christ as a great ethics teacher or as a great prophet, but if you deny these essential matters of faith you have merely praised a form of Godliness while denying the power thereof. It is that simple.
Islam denies these things. Islam is Anti-Christ. It is that simple.