You are. Disguising it as skepticism or whatever, is still calling Him a liar.
Tell me, without the Bible, how do you expect to know about God?
What is your source of knowledge about the supernatural? Including God?
I don’t know much at all about the supernatural. My limited understanding, offered in humility is that the natural is what we see, hear, touch, smell.
I have been told by Christians that G-d created the natural world, but that I do know know.