The Bible says to “not lie with mankind, as with womankind” for it is “abomination”:

Leviticus 18:22 King James Version (KJV)
²² Thou shalt not lie with mankind, as with womankind: it is abomination.

Leviticus further says “they shall surely be put to death”:

Leviticus 20:13 King James Version (KJV)
¹³ 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.

Romans says “even their women did change the natural use into that which is against nature”, and the men “leaving the natural use of the woman, burned in their lust one toward another” and that “that they which commit such things are worthy of death”:

Romans 1:24-32 King James Version (KJV)
²⁴ Wherefore God also gave them up to uncleanness through the lusts of their own hearts, to dishonour their own bodies between themselves:
²⁵ Who changed the truth of God into a lie, and worshipped and served the creature more than the Creator, who is blessed for ever. Amen.
²⁶ For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature:
²⁷ And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet.
²⁸ And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient;
²⁹ Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers,
³⁰ Backbiters, haters of God, despiteful, proud, boasters, inventors of evil things, disobedient to parents,
³¹ Without understanding, covenantbreakers, without natural affection, implacable, unmerciful:
³² Who knowing the judgment of God, that they which commit such things are worthy of death, not only do the same, but have pleasure in them that do them.

Transgenderism often involves cross-dressing; women wearing “that which pertaineth unto a man”, and men who “put on a woman’s garment”, but “all that do so are abomination unto the Lord thy God”:

Deuteronomy 22:5 King James Version (KJV)
⁵ The woman shall not wear that which pertaineth unto a man, neither shall a man put on a woman’s garment: for all that do so are abomination unto the Lord thy God.

The Bible says the “unrighteous shall not inherit the kingdom of God” and then is quoted saying “nor effeminate, nor abusers of themselves with mankind”, “shall inherit the kingdom of God”:

1 Corinthians 6:9-10 King James Version (KJV)
⁹ Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,
¹⁰ Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.

God made them only “male and female” to become “one flesh”:

Mark 10:6-9 King James Version (KJV)
⁶ But from the beginning of the creation God made them male and female.
⁷ For this cause shall a man leave his father and mother, and cleave to his wife;
⁸ And they twain shall be one flesh: so then they are no more twain, but one flesh.
⁹ What therefore God hath joined together, let not man put asunder.

Sodom and Gomorrha were “going after strange flesh” and suffered the “vengeance of eternal fire”:

Jude 7 King James Version (KJV)
⁷ Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire.

The men going after strange flesh, of the city of Sodom asked Lot to bring out the men saying “that we may know them” but refused “two daughters which have not known man”, and the men in Lots house said “for we will destroy this place” and “the Lord hath sent us to destroy it”:

Genesis 19:4-13 King James Version (KJV)
⁴ But before they lay down, the men of the city, even the men of Sodom, compassed the house round, both old and young, all the people from every quarter:
⁵ And they called unto Lot, and said unto him, Where are the men which came in to thee this night? bring them out unto us, that we may know them.
⁶ And Lot went out at the door unto them, and shut the door after him,
⁷ And said, I pray you, brethren, do not so wickedly.
⁸ Behold now, I have two daughters which have not known man; let me, I pray you, bring them out unto you, and do ye to them as is good in your eyes: only unto these men do nothing; for therefore came they under the shadow of my roof.
⁹ And they said, Stand back. And they said again, This one fellow came in to sojourn, and he will needs be a judge: now will we deal worse with thee, than with them. And they pressed sore upon the man, even Lot, and came near to break the door.
¹⁰ But the men put forth their hand, and pulled Lot into the house to them, and shut to the door.
¹¹ And they smote the men that were at the door of the house with blindness, both small and great: so that they wearied themselves to find the door.
¹² And the men said unto Lot, Hast thou here any besides? son in law, and thy sons, and thy daughters, and whatsoever thou hast in the city, bring them out of this place:
¹³ For we will destroy this place, because the cry of them is waxen great before the face of the Lord; and the Lord hath sent us to destroy it.