[N]o ideal form of anything exists anywhere.
I disagree, as it's certainly possible to construct an ideal form of something in one's mind.
The problem I see with that is that if there is an ideal, that implies one. So if you ask everyone you ran into to imagine the ideal random object, I bet you wouldn't get two alike.I agree, and I actually don't see anything wrong with that.
Such squabbling is the result of human nature, which seems to be naturally inclined to sectarianism. However, a number of philosophers and students of religion have pointed out the broad similarities that exist between the major religions, aka "the perennial philosophy".