By your logic, your answer is wrong.
My next door neighbor to the right thinks that the President is doing a great job. My next door neighbor to the left thinks the President is doing a bad job.
According to your logic, there MUST be at least 2 different Presidents of the United States at this time, because one neighbor says one thing about him (that’s one) and the other neighbor says another thing about him (one plus one equals two). If I talk to the neighbor across the street, it might turn out that we have a third POTUS.
Since you insist that if Christians and Moslems believe differently about God, there must be 2 Gods then the same applies to the POTUS. Since two neighbors believe differently about POTUS, there must be two POTUSs. That’s your logic. I’m following your line of reasoning.