"Agnosticism is the philosophical view that it is unknown (or even, unknowable) whether any deities (god or gods) exist or not. Some people who call themselves "agnostic" say that it is not possible for anyone ever to know if there are any deities or not. Other agnostics, though, say only that they themselves currently do not know if there are any deities."Since the person who coined the term gave it a definition that disagrees with yours, I think using your definition would create confusion, not avoid it.
Agnosticism - Simple English Wikipedia, the free encyclopedia
For the record, I didn't write that in the wikipedia...