1.) I was raised in a fairly liberal congregation of the
Evangelical Covenant Church. My mother was raised Catholic, my maternal grandfather is an agnostic, father was raised ECC, my pateral grandmother was ECC, my paternal grandfater was a Presbyterian minister, and my paternal step-grandfather is an atheist. I say this becasue I wonder if any of it had something to do with my father's turn towards fundementalist Christianity when I was a child (I was taken to a Benny Hinn event when I was 10 or so). I also believe that his turn towards fundementalism was based in part of my sister's illness (congenital brain tumor and epilepsy). I was pulled out of the ECC when I was 14, a week before I was supposed to be confirmed. We then spent several years attending various evangelical and fundementalist churches, including a memorable stint at a mostly black evangelical church, followed by a few months at a "non-denominational" charismatic church (one of my favorite memories is my father attemping to explain to a visiting French foreign exchange student what a "charismatic christian" is). I myself attending an evangelical youth church before a combination of my doubts and my father's conviction that there was something not right about it removed me from that, too. After this point, I basically ceased regular church attendance. We have to choose neutral churches for Christmas and Easter, and it usually pisses someone off. I remember the Easter before last, my father dragged us to an Assembly of God church. My mother and I sat, tight-lipped, through the sermon, which focused more on the sacrifice on the cross than the resurrection (musically irritating, too. Raised basically Lutheran, I feel cheated at Easter if I don't get one big Swedish anthem and one hymn that includes the line "Where, o death is your victory? Where, o grave, is your sting?"). My mother and I had been planning to go to Latin mass that Easter, since she grew up with it, and I'd never been. At that point, I started shopping around for a a church of my own, mostly for the community, and eventually ended up attending a local Episcopalian chapel, although no regularly. So, to sum up, I consider myself to be part of the Protestant tradition, and if someone really pressed me for a denomination, I'd probably say Episcopalian, although that's loose.
2.) I have a hard time defining God. I refer to him with a male pronoun, but that's because I'm male, and that's easier for me to process. As for his nature? I don't know. The only things I'm reasonable sure of are eternal and omnipresent. I can accept omnipotent, especially if he gave his creations a large amount of free will (which is how the line "make them in our image" seemed to play out for me). I tend to think that God lives outside of time, experiencing every moment as "now." I believe that the laws of physics are either set by God, or are some aspect of him. I believe in some version of the Holy Spirit, acting as a conscience, which we ignore to a greater or lesser extent. I believe that Jesus existed, and was a great preacher, but I'm not altogether sure of his status as divine, or if he was merely blessed. I believe the Bible to be a collection of stories and allegories and commentaries for us to study (again, I was raised Christian, so my frame of reference is Christian) to understand God as he has been seen and how we may see him in the future. I am, I guess, an Agnostic Theist. I believe any true knowlege of God to be impossible, at least from a human point of view, although I choose to believe based on how I was raised, how I have come to view the universe, and felt experiences. It's an innate faith, unproven, but there and not going away.
3.) My belief is rational, to a point. I cannot prove the existence of God, but based on what I believe, it's filtered through some logic. I tend to be a fairly rational person. I do, however, sometimes cop out by claiming that belief in God is not necessarily a rational process, or that while rationality and belief are not inherently in conflict, they do not lead to eachother. More on this as it develops.
4.) Upbringing, lived experience, thinking late at night about "how did we come to be here and what else is out there?" They way the universe works, how things happen (planets rotate, things fall because of force generated by the mass of those planets, water freezes in predicable ways) suggests to me some sort of order, maybe not a conscious "this goes here, that goes there" order, but some pattern of organization. I could be wrong though, but that's what I believe*.
*which might as well be the motto of an Agnostic Theist, right?