In Genesis: "Let Us make man in our image, and let them rule over the fish in the sea . . . and God said to them, "Be faithful and multiply, and fill the earth, and subdue it."
Lest still scratching your head, relax and be blissful. The justification from God cannot be clearer. Not to worry or hurry, though. You have the rest of your life to comment on his achievement. Let me offer mine.
First, he created us out of vanity. We look like him. Whenever we are go, we are doing no less than to show his image to the fish, the cattle, and so on. God is omnipresent, lest you forget what Big Brother looks like. No propaganda can be broader.
Second, he warns us to be faithful to him. God is great. Worship nothing else. I am your Lord, maker, redeemer, savior, and guardian. Don't you dare forget for one moment. Indeed, this is the sole reason for your existence: to sing, pray, plead, and glorify me.
Third, he wants us to fill the earth. What if the earth is overfilled by us? Is he about to give us one more earth? He does not seem to care. It is our worry? Fine for such ungrateful brute. Birth control has never crossed his mind.
Fourth, he wants us to subdue it. Hey, why did he not do it himself? I wonder, with due respect, whether he is lazy, selfish, lonely, or scared.
Fifty, why did he ask us to subdue the earth? Would it be acceptable to leave the earth in peace, keeping every beauty in the Garden of Eden. I hope he does not mind me saying so, but I am afraid he is giving us a hard time, before that vague promise of joining him in heaven, where we can expect more high quality treatment.
I would like to ask him directly as a slave and servant to the Master; Sir, I have done all you have asked me to do. Now what?