I thought I was getting into more than I could handle
I'll do my best
Oh, and I'm a bit blunt, as you could tell
As far as free will, Scripture supports it (Jeremiah 19:5, Deuteronomy 30:18 or 19, I think). Those aren't the only scriptures, but those are the ones that stick out most to me. Oh, and I don't go to movies or anything to find out about demonic stuff; nothing big has happened to me, but some stuff has. That may just be me not being able to explain why it happens, but from what I can tell it's not normal.
As far as dual concept wise, God existed before the devil existed, and there was where there was no "polar opposite" of God.
And from my statements regarding God moving through us and levitations and what not, don't take my words heavily, as it seems what I said literally made no sense. While prayers connect us to God in a way, it isn't because demonic crap/stuff happens.
I know God moves through me because I do what the Bible says to do (now I'm not perfect, of course). There isn't a feeling. I don't feel God move through me at all. People can't. While I do feel the Holy Spirit stirring inside of me, I don't look for that feeling. But I'm rambling there.
I've taken the Bible to a point where I don't just regard it as a book, but the word of the living God. I know because the Bible tells me so. Not exactly a better answer than "I just know" but it's at least better.
I don't have any examples of well known levitations or verified ones at that, nor will I look one up. You don't have to take my word that these things happen, either. But people release the power of the devil every day. Even people who are born again (and they probably don't mean to, either, but people do have choices). The power of the devil is death, and the power of God is life. When we speak swears or curse people or in plain terms put other people down, even if we do these things jokingly, we release the power of the devil because what we would be saying would not be of God, as God would not want us to do those things. However, when we speak the Word of God, we release life. After all, life and death are in the power of the tongue.
And you're exactly right "You can't draw from your natural senses to interact with God." The Bible says we are supposed to worship Him in spirit and in truth. However, you need faith to believe if you want to see.
But it is possible to believe in God because the Bible gives us knowledge about who He is. There's your prior knowledge.
And even if that isn't a good enough argument, every believes in something they can't see. Even you. Yet people 'just know' those things exist. If you would like for me to elaborate on this, I can do that
I don't think you've factored in the concept of 'faith' either. Believing what you can't see/taste/touch/hear/smell is a sort of definition of 'faith'. And we have faith in what we can't see all the time. You, me, everyone.
I hope I haven't provoked more questions than what you've asked here; I don't have all the answers (which is obvious, but I need to state it). I also hope that my answers are sufficient enough.
It all comes down to whether or not you believe what the Bible says about everything.