@ OP:
First problem is with your premise that all people are God's children. Biblically this isn't the case:
John 8
42 Jesus said to them, “If God were your Father, you would love Me, for I proceeded forth and came from God; nor have I come of Myself, but He sent Me. 43 Why do you not understand My speech? Because you are not able to listen to My word. 44 You are of your father the devil, and the desires of your father you want to do. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he speaks a lie, he speaks from his own resources, for he is a liar and the father of it."
Paul alsr refers to our adoption as God's children several times, indicating that we are not born as children.
So, your arguments based on proper treatment of children are groundless.
First problem is with your premise that all people are God's children. Biblically this isn't the case:
John 8
42 Jesus said to them, “If God were your Father, you would love Me, for I proceeded forth and came from God; nor have I come of Myself, but He sent Me. 43 Why do you not understand My speech? Because you are not able to listen to My word. 44 You are of your father the devil, and the desires of your father you want to do. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he speaks a lie, he speaks from his own resources, for he is a liar and the father of it."
Paul alsr refers to our adoption as God's children several times, indicating that we are not born as children.
So, your arguments based on proper treatment of children are groundless.