I'm a Christian, but I don't think that passage means human biology is based on God's.
God the Father is clearly not in a physical form throughout the Bible. I believe that's why "graven images" are forbidden in the Ten Commandments, as they'd mislead people into thinking of him as a physical being. God the Father as depicted in the Bible is closer to an omnipresent, omniscient mind that runs the universe as a simulation inside itself and occasionally talks to entities inside the simulation through avatars, dreams, and visions.
Rather, I think "in his own image" there refers to sapience, self-awareness, and creativity - what is called elsewhere in Scripture "the breath of God".
Much of what makes the Incarnation of Christ so meaningful is precisely that God is made man, with hands, feet, head, and heart. He is Emannuel, "God with us," come to debug and repair the system we broke from within, knowing our suffering and giving us the knowledge and strength to help repair it ourselves.
That all loses a lot of its meaning if God the Father is just a big man on a throne in a cloud somewhere (an image that I have never found anywhere in the text and am puzzled as to where it came from). He was always just one of us if that's the case.
So, yeah. Despite apparently sharing your fundamental beliefs about the world, I think you're way off base about why humans walk.