Yep. Christ is fully God and fully man and His geneology, life and purpose of His death and resurrection are very clearly spelled out in His word. If you are not a descendent of Adam, the “gospel” does not apply to you. And baptism is ALL about the gospel - the good news of Christ’s sacrifice and its purpose.
I don’t understand your theology.
You seem to be saying God is not God and Creator of the universe and any other life that may exist.
To my mind, if there are any other creations in God’s image, then Christ is also their Lord. Do you disagree?