In my theology:
God, father and overseer. Has a physical body similar, but not identical (his is obviously immortal) to our own.
Jesus, seperate entity, Creator of Earth under the supervision of the Father, eldest spirit child of the Father (quite literally our oldest brother). When he came to Earth he recieved a body (which is necessary for eternal progression) which was physically fathered by the Father, as opposed ot the rest of us, who are only spiritually fathered. Before that he existed only as a spirit.
Also, a matter of personal taste, I hate it when people say: "Jesus died for your sins" because then that sounds like your accusing the other person of sinning. And "jesus died for my sins" makes it sound like he's your exclusively personal savior, which is rather hubratic (is that a word?)
I much prefer "Jesus died for our sins".
Before the fall, the Earth was in a state of innocence, but also spiritually stagnant. Without knowledge, choice and agency was pointless. That's when Adam tasted the fruit, and gained knowledge. Except with knowledge came responsibility, and we were all held accountable for our acts that we committed when we knew better.
Hence the atonement.
