One would think they would be easy to find and quote then, in these days of Wikipedia and the entire Bible and Quran on-line. But I couldn't find references you say the scriptures of Islam encourage. What are you relying on for that statement?
Wikipedia did list four New Testament bits that condemned gays, along with other sexual sinners, although there's understandable disagreement, because the original ancient Greek didn't have a word that precisely translates into today's 'homosexual'. Not to mention, different times, different cultures, different morals and standards, even different Christianity, back then, way over there.
The Quran is used as a catch all for the purposes of discussion. It is difficult for non Muslims to find such quotes because the Scriptures of the Islamic faith are spread between many sources.
The Quran, The Hadith, Sharia, etc.
Plus accurate English translations of such are difficult to find. The religion actively resists these scriptures being translated to any other language.
I am still sifting for quotes on punishment for Gays. However, I quickly came across quotes for the punishment of Apostates in the Hadith.
“Whoever changes his religion, execute him.” (Narrated by al-Bukhaari, 2794)
Further;
"The Prophet (Muhammad) said: “It is not permissible to shed the blood of a Muslim who bears witness that there is no god except Allaah and that I am His Messenger, except in one of three cases: a soul for a soul (i.e., in the case of murder); a married man who commits adultery; and
one who leaves his religion and splits from the jamaa’ah (main group of Muslims).” (Narrated by al-Bukhaari, 6878; Muslim, 1676)
Finding the quotes for punishment of Gays will take longer as I believe it starts in the story of Lot if memory serves, and then spreads into Sharia.
As for the new testament, condemnation is not a recommendation for punishment. In fact the overarching teachings of the New Testament states that No one other than their God can judge man, which pretty much precludes punishment.
Which basically translates to, just because God has told you something is wrong, doesn't mean you can judge and punish another for doing so.
It also teaches that their God is forgiving.
This marks a fascinating tonal shift in the God depicted in the Old Testament, as apposed to the God depicted in the New Testament.
The Old Testament God was a vengeful God that used fear to ensure obedience.
The Stories of banishing Adam and Eve for disobeying him, and flooding the world and sparing only Noah to punish man kind.
This more foreboding God influenced many of the Old Testament scriptures as well. many being violent and cruel.
Not surprisingly, the Old Testament theology factors in greatly with the Islamic Faith, and serves as a base for which much of Islam is founded.
The New Testament is a fascinating theological occurrence, as it represents one of the few complete religious ret-cons, as it were, of any major world religion.
The Depiction of God is completely changed.
Instead of God being a vengeful, one that punishes mankind. God is now depicted as an all loving one that wants to save mankind.
Instead of demanding mankind to be faithful to him, he sacrifices his son to save mankind and convince them to be faithful to him.
He teaches his followers not to punish those that transgress him, but to love and accept those who transgress against him.
The entire concept of a one God, from his characterization, to his actions, to his teachings, does almost a complete 180, and moves from a decidedly aggressive religion, more befitting of the societal traits of ancient times, to an almost pacifistic religion, having more philosophically in common with Buddhist, and other contemporary eastern religions of the period. Understandable considering the regions increased exposure to other distant cultures brought about by the far reaching trade and transportation routes of the Roman Empire.
It was such an abrupt change from the Old Testament that it makes one wonder why New Christians at the time chose to keep the Old one at all. Although having a common base of theology to build upon, thus making it easier to convert the predominantly Jewish population at the time, most likely was a contributing factor. Just as it was for Muhammad in his choice to do the same.