I understand that. But the problem is that this false revelation is about God himself! In today’s terms, it’s like saying " I believe in God, but He is a woman." And you say, my God is a spirit. Then you say, but there is only one God! And I say, “yes, I believe that too, but what you describe cannot possibly be my God!”
I agree with you that the bone of contention is the revelation (completely). I’m saying, if they hold strongly to this teaching (whether it be false or true to them), it automatically follows that we can’t be talking about the same person. They believe in trinity? i’m sure they are not the only other religion that believes that. It doesn’t mean we are talking about the same person. Why? Because the God that has been revealed to them, by a prophet (mohammed) says clearly that he does not Have A Son!
They believe in this God, not mohammed. They believe in him who has been revealed to them by a great prophet, His Prophet.
You say they believe in lies told them by a prophet about the one true God. I say, if that is the case, THEY KNOW NOT WHOM THEY WORSHIP!!! They don’t know Him whom they PROFESS to serve, and since they don’t know him, they cannot truly be serving him. So, they do not worship the one true God.
This is my argument.