No, He wasn't. He was like us in all ways but without sin.
1. God worked miracles through many people as can be seen in the biblical record.
2. Jesus was, and is, God.
He absolutely was mortal, if He wasn't then He couldn't have died. He is immortal now, after the resurrection; just as we will be after we are raised up from the dead at His Parousia. But He was conceived and born a mortal human being, like you and me.
Yes He was.
Scripture says that by one man's disobedience death came to all men. Jesus, being a human being, was therefore subject to death the same as all men. "For as in Adam all die" applies to Christ, but Christ changed the game, for by His obedience and His work He undid what Adam had done, therefore in Christ all are made alive, and through the Second Adam's obedience has come resurrection of the dead to all men.
He died because He was born a mortal man of the progeny of Adam, which is also why we die. Indeed, death isn't exclusive to human beings, perhaps you've noticed that animals, plants, and fungi also die. Death, in fact, applies to the whole of creation. If we only die because we sin, then you may want to ask yourself what sin that banana you ate the other day committed, or what sin your niece's recently departed goldfish committed.
He's the Second Adam because He undid what Adam had done, He is the second Adam by His death and resurrection by which, in Him, we have been freed from Adam's curse having the hope and promise of resurrection and eternal life.
That's heretical, Jesus is the very eternal and uncreated Logos, He is God the Son, and therefore one with the Father and the Holy Spirit. God does not deny God. God did not turn away from Christ, the Spirit did not leave Him; He remained in death eternal and Almighty God, the Uncreated Creator of all things, one in Being with the Father and the Spirit. The Holy Trinity cannot be divided.
So your view of what transpired on the cross is not just problematic, it's heretical.
-CryptoLutheran