Well.......in fairness to those who look at the Bible dubiously, I can appreciate how they would see that quoted scripture is less than persuasive. I am unimpressed when people try to convince me with quotes from blatantly ultra liberal writings or suggest I should read something by an author who is only slightly right of Lenin.
Mesquite, I missed your question re that Bible passage. It speaks, I think from the culture of that time and is intended to emphasize that the first allegience is to YHWH and disobedience to YHWH will not be tolerated even if the disobedient one is your own son. (A critical view of the Old Testament also reveals a lot of old-fashioned Jewish exaggeration included there too
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In judging the people of that time, I think we need to look at it from their culture, education, experience , etc. and not measure them by 21st Century ethics or morals. I know lots of Jewish people and Christian people and don't believe a single one of them would condone stoning somebody to death now.