I've certainly got a bias, but it's no more of one than when physicists or other scientists try to blame mathematics for things that go wrong in the course of their own discipline!
That would be anthropocentric if I claimed that, yes... but I didn't. I just said that it has existence separate from human contemplation of it, nothing about mathematics being the only way to do anything.
And if that's the case, that mathematics or its subject of study has some existence separate from human contemplation of it, it seems odd to say that it has nothing to do with reality. Introducing the problem of defining what a fruit is is again attempting to drag one of the problems of science into mathematics, btw.
If aliens ended up developing the exact same theology, which hasn't even happened independently between separate cultures on Earth, that would be pretty notable, yes.
Whereas if aliens developed mathematics reconcilable with human mathematics, many aspects of which have been developed independently in Earth history, no one would be anywhere near as amazed as they would be if we encountered an alien civilization practing, say, Theravada Buddhism.