God is the super-duper metaphysical Being who created the universe and all that is in it. He transcends time and space because He created it, hence physical specks
like us can't see Him or fully comprehend Him.
God loves humanity, but gave
humans a choice to love Him back. Mankind collectively rejected this offer when the universal representative (some
dude called
Adam) said 'no thanks bucko,' culminating in everything going to the
dogs and the world plunging into turmoil and suffering, which was fair enough really.
Nevertheless, despite being rejected by His own creation, God sent His Son to
earth as a random called Jesus, who died the death we were meant to die. If you are Jesus' friend and you bite the bullet, you can sneak past security with him at the pearly gates, but otherwise you're stuffed.