Wow, just wow! 11 days and 331 replies, and not a single one that addresses the question in the thread title. Although it is sort of a loaded question.
“God’s opposition to homosexual behavior, why?”
Before anyone can even begin to answer the question, one has to determine the specific meaning of “homosexual behavior.”
The Noun “homosexual” is defined: someone sexually attracted to people of the same sex; the Adjective “homosexual” is defined: sexually attracted to people of the same sex.
The Noun “behavior” is defined: 1) manner of acting or controlling yourself; 2) the action or reaction of something under specified circumstances; 3) the way a person behaves toward other people; 4) the aggregate of the responses or reactions or movements made by an organism in any situation.
According to the dictionary definition, “homosexual behavior” means: someone who acts like they are sexually attracted to people of the same sex. So to slightly rephrase the question: Why does God oppose homosexual behavior? The answer is very simple: He does not.
There is not one single Mitz’vah throughout the entirety of Torah that says: “You will not act like you are sexually attracted to anyone of the same sex.” There is in fact not one single Mitz’vah throughout the entirety of Torah that says: “You will not be sexually attracted to anyone of the same sex.”
Vayyiq’ra/Leviticus 18:22 is very simple and straightforward about what is prohibited, and why. “You will not be sexually intimate with a male: it is a toʿévah.” Sexual penetration between two males is prohibited, not sexual attraction. Why? It is a toʿévah. So what is a toʿévah?
The dictionary definition of – תּוֹעֵבָה – toʿévah is: abomination, shameful deed, profanity, scabrousness, villainousness, anathema; idol, idolatry. In English translations of the Hebrew Scriptures the word toʿévah is translated in descending order: abomination; detestable; disgusting; loathsome. Even though these are perfectly acceptable translations, they are still somewhat ambiguous.
Context is everything. The word toʿévah is used 110 times throughout the Hebrew Scriptures, with one common context; it is describing forbidden religious practice. Why would Vayyiq’ra/Leviticus chapter 18 be the only exception?
“You will not be sexually intimate with a male, because it is a forbidden religious practice.” Even though it is also an unlawful sex act, sexual intercourse between two males is a violation of the most serious crime there is – idolatry.