You are over your head in that you presume to instruct from the Bible which you say you don't even believe. I wonder if you have ever read the bible through. The fact is the bible will judge you one day instead of you judging it. You assume this son is a "child" or young boy who is guilty of only being ornery, when clearly he isn't. He is a full grown man. He is is a determined [stubborn], rebellious, and habitual drunkard [v.20]. The son is rebellious not only to his parents but also to God.Though the nature of the rebellion is not clearly stated the implication is that of some grievous and major sin such as blasphemy or other sin worthy of death at that point in Jewish history. The consequences of this rebellion are apparent in home and community. Every warning and admonition are unheeded by the son [v.18.] It is required that the parents present their son to civil authorities [v 19] and indicate the nature of the crimes. The execution then comes from the community because ultimately the son's crime affects the entire community [v.9.] By the way, the absolute right of parents to control and even kill their offspring was far more cruel and unrestricted in other ancient cultures including the Assyrians, Persians, Greeks and Romans. God greatly restricted or much mitigated this abuse among the Hebrews.