From your interactions with theists, what have you learned about God or what considerations about God have those interactions given you?
Well, I don't believe in God, so the answer would have to be 'nothing'. I don't believe that the word 'God' has any reference, so I don't think that there's anything in existence to learn about.
I'm not entirely comfortable with the word 'theist'. It's an awfully broad and rather artificial analytical category, seemingly derived in large part from the special monotheistic concerns of the Judeo-Christian-Islamic family of religions.
When it comes to interactions with theists and studying theistic traditions, I've learned quite a bit about how these people conceive of 'God'. (That's rather different than learning about God.)
I'm not sure if I can summarize it, since ostensibly theistic conceptions of God seem to be all over the map. Some say God has these qualities, some say those qualities, and others question whether God has qualities at all (and perhaps go with a theory of analogical language or something).
For myself, it is only after interacting with theists that I seriously began to consider that God may be evil, or that He doesn't exist.
I've never thought that God existed, even as a small child. Talking to theists hasn't done much to move me towards thinking that 'he' does.
As for God being being evil, I'm with you. That idea never crossed my mind until after too many religious nuts had preached turn-or-burn hell-fire in my direction.
It suddenly occurred to me that the image of a God that would torture people unspeakably for eternity with no possibility of escape... ever... merely for the crime of not groveling properly, was an image that's morally indistinguishable from Satan.
In fact Satan emerges as the more sympathetic and far more heroic character, since he's the one willing to say 'No!' to God's face, in full knowledge that God will eventually tear him to pieces for his disobedience. Satan becomes the model of one who's willing to stand up for principle, even in the face of impossible odds.