This is a screenshot I made a little while ago, from Facebook (with the names and icons blocked out). It shows a discussion among some Christians on Facebook who apparently are not familiar with the Bible, and don't believe the Bible really says these things they find so disturbing.
Believers, you might be surprised what the Bible says, if you actually read it. Cover to cover, not just cherry-picking a few favorite passages. Having 15 Bibles on your bookshelf doesn't count if you don't read them.
I'm not a believer, and I have no problems with gay people. But even I know that the directive to execute those who practice homosexual acts is right there in the Bible.
For the record, here's what the Bible says on the topic of whether gays must be put to death, in Leviticus 20:13:
The New Living Bible translation:
"If a man practices homosexuality, having sex with another man as with a woman, both men have committed a detestable act. They must both be put to death, for they are guilty of a capital offense."
The Holman Christian Bible translation:
"If a man sleeps with a man as with a woman, they have both committed a detestable thing. They must be put to death; their blood is on their own hands."
The International Standard Bible translation:
"If a man has sexual relations with another male as he would with a woman, both have committed a repulsive act. They are certainly to be put to death."
The God's Word Bible translation: "When a man has sexual intercourse with another man as with a woman, both men are doing something disgusting and must be put to death. They deserve to die."
The King James Bible translation: "If a man also lie with mankind, as he lieth with a woman, both of them have committed an abomination. They shall surely be put to death; their blood shall be upon them."
That's just scratching the surface of the groups of people that the Bible commands should be put to death. Others include women who aren't virgins on their wedding night (Deuteronomy 22:20-21), sons who disobey their parents (Deuteronomy 21:18-21), anybody who follows other religions and everybody else
who lives in the same town as that person (Deuteronomy 13:13-16), those who work on weekends (Exodus 31:12-15), and many more.
If you find these shocking, wait until you read God ordering genocide (such as Deuteronomy 7:1-2 or 1 Samuel 15:2-3), or read divine advocacy of slavery (such as Leviticus 25:44-46, Exodus 21:20-21, and Ephesians 6:5), or some of the things the Bible says about women (such as Ecclesiasticus 25:19-24), or racism (such as Matthew 15:22-26).
Even those passages don't prepare you for the magnitude of what you'll find when you read the Bible cover to cover. Please, don't take my word for it. Read it, yourself.
If you believe the Bible is the word of God, you owe it to yourself to read what the Bible actually says.
As for me, I do not find it believable that the Bible is the word of God, and I do not find "The Good Book" to be a good book.
Edited to add: Here are links to each of the passages mentioned above, in online Bibles, to make it easier for you to see for yourself.
Leviticus 20:13 (about executing homosexuals)http://biblehub.com/leviticus/20-13.htm
Deuteronomy 22:20-21 (about executing women who aren't virgins on their wedding night)https://www.biblegateway.com/passage/?search=Deuteronomy+22%3A20-21&version=NKJV
Deuteronomy 21:18-21 (about executing disobedient sons)https://www.biblegateway.com/passage/?search=Deuteronomy+21%3A18-21&version=NKJV
Deuteronomy 13:13-16 (about executing followers of other religions - and every other person in their town)https://www.biblegateway.com/passage/?search=Deuteronomy+13%3A13-16&version=NKJV
Exodus 31:12-15 (about executing people who work on weekends)https://www.biblegateway.com/passage/?search=Exodus+31%3A12-15&version=NKJV
Deuteronomy 7:1-2 (one of many examples of God commanding genocide in the Bible)https://www.biblegateway.com/passage/?search=Deuteronomy+7%3A1-2&version=NKJV
1 Samuel 15:2-3 (another example of God commanding genocide)https://www.biblegateway.com/passage/?search=1+Samuel+15%3A2-3&version=NKJV
Leviticus 25:44-46 (one of many Bible passages condoning slavery)https://www.biblegateway.com/passage/?search=Leviticus+25%3A44-46&version=NKJV
Exodus 21:20-21 (another pro-slavery passage, condoning beating slaves to death, as long as they don't die within a day or two)https://www.biblegateway.com/passage/?search=Exodus+21%3A20-21&version=NKJV
Ephesians 6:5 (more Biblical "wisdom" about slavery)https://www.biblegateway.com/passage/?search=Ephesians+6%3A5&version=NIVUK
Ecclesiasticus 25:19 (some Biblical "wisdom" about women)http://www.kingjamesbibleonline.org/Ecclesiasticus-25-19/
Ecclesiasticus 25:24 (more "Biblical "wisdom" about women)http://www.kingjamesbibleonline.org/Ecclesiasticus-25-24/
Matthew 15:22-26 (an example of Biblical racism)https://www.biblegateway.com/passage/?search=Matthew+15%3A22-26&version=KJV