Perfection!

[Purple Rabbit]

I totally agree with: "I have no evidence of X so that's why I have no belief in X" and that could be relevant for debate on X since it is an open invitation to present evidence for X. But the faith statement you make of it ("I don't believe I know of any evidence for the existence of X in an objective or absolute sense") suggests that some inability to retrieve your own knowledge is presented as a reason (i.e. argument) for absence of belief. And that indeed is argument from ignorance.

If you question that you know X than you must also question that you believe X and infinite regress results: "I don't believe, that I don't believe, that I don't believe,...that I know of any evidence of X"