Now on to what you said referring to adultery. You say 'While it is true that adultery is punishable by death in the Old Testament, one must realize that the laws given in Leviticus were and are intended for Jews only.'. This simply isn't true. Matthew 5:17 prove that the laws are to be fulfilled (or carried out) by the Messiah and subsequently His people. I read the Beatitudes every day before work and in the Beatitudes Yahshua the Messiah, or Saviour tells us that they are laws in the Hebrew Scriptures but Yahshua is magnifying those Laws so as to be even more inclusive and all encompassing to our every day lives. For example, Matthew 5:27 isn't just supporting the Hebrew Scriptures Levitical Law on not committing adultery, but to magnify that Law by saying that even looking at a woman and lusting after her is an evil.
The Laws found in the Hebrew Scriptures are meant for all people's who are trying to please Yahweh. Even the commandment to love our neighbour is first found in the Hebrew Scriptures in
Leviticus 19:18, and yet many Chr-stians act like this is a new New Testament thing. The only laws that no longer applies is the sacrificial laws (
Hebrews 9:9) since Yahshua was the perfect sacrifice. Romans 7:12 tells us clearly that the laws in the Bible are "
holy, and the commandment
holy, and
righteous, and
good."
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You say "For starters, just what exactly is the legal definition of 'adultery'?". Well the definition of adultery is voluntary sexual intercourse between a married person and a person who is not their spouse. In terms of what this covers, well it covers sex and the definition of sex is sexual activity, including specifically sexual intercourse. If two homosexuals have sex, then that's a different matter, since the implication from Biblical Law is that homosexuality is prohibited in the Bible in Leviticus 18:22 punishable by death.
'And what of evidence?'. Good question. How would one prove that adultery has taken place. Well, according to the Bible, you need two or three witnesses all in agreement to establish evidence according to
Deuteronomy 17:6. We don't believe in circumstantial evidence. A DNA check would work as one piece of evidence, but you would need another one or two pieces of concrete evidence (such as a testimony) to prove that adultery took place. Therefore you are right, it would be difficult, even in Biblical times to punish adultery with death because of the lack of evidence, but sometimes it would be provable. If one confesses to the crime and the other does not, then that would not be grounds for punishing the supposed perpetuators with death. Yahweh's Law is righteous.
You say 'Curiously, though, adultery in the military is still administratively punishable under the Uniform Code of Military Justice- not for any biblical reason, but rather because it contributes to disruption in the ranks and can easily affect the morale and behavior of the troops.'. I was really interested in the story you told regarding this. Intriguing. But can you tell that it would be hypocritical for the military to impose certain codes to live by, yet when out of the military one could fragrantly break those codes. Codes are supposed to be for life. Too many people, whether that is in the military or schools or whatever reluctantly accept the codes their institutions have to offer, but when the opportunity arises, they no longer continue in these practices. Another example could be wearing skirts in school. Most schools demand that skirts go below the knees. This is a good practice I don't have to explain why, but it seems girls or women do not choose to adhere to these same good codes when they leave school, despite them being there for a reason.
What I'm trying to say in a rather long-winded way is that the military rightly so believes adultery adds disruption, chaos and confusion in the ranks and this is the same that it does out in the lives of the people it effects, therefore it should be prohibited by Law.