"Then shall he say to them on the left hand, Depart from me ye cursed, into everlasting fire, which is prepared for the devil and his angels." [Matthew 25:41]
"But the fearful and unbelieving, and the abominable and murderers, and whoremongers, and sorcerers, and idolaters, and all liars shall have their part in the lake which burneth with fire and brimstone, which is the second death." [Revelation 21:8]
"And these shall go into everlasting pain, and the righteous into life eternal." [Matthew 25:46]
"Which shall be punished with everlasting perdition from the presence of the Lord, and from the glory of his power." [2 Thessalonians 1:9]
"Wherefore if thine hand cause thee to offend, cut it off: it is better for thee to enter into life, maimed, than having two hands, to go into hell, into the fire that never shall be quenched." [Mark 9:43]
"As Sodom and Gomorrah, and the cities about them, which in like manner as they did, committed fornication, and followed strange flesh, are set forth for an example, and suffer the vengeance of eternal fire." [Jude 1:7]
"Strive to enter in at the strait gate: for many, I say unto you, will seek to enter in, and shall not be able. When the good man of the house is risen up, and hath shut to the door, and ye began to stand without, and to knock at the door, saying, Lord, Lord, open to us, and he shall answer and say unto you, I know you not whence ye are, then shall ye begin to say, We have eaten and drunk in thy presence, and thou hast taught in our streets. But he shall say, I tell you, I know you not whence ye are: depart from me, all ye workers of iniquity. There shall be weeping and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the Prophets in the kingdom of God, and yourselves thrust out at doors." [Luke 13:24-28]
"Though they dig into the hell, thence shall mine hand take them: though they climb up to heaven, thence will I bring them down. And though they hide themselves in the top of Carmel, I will search and take them out thence: and though they be hid from my sight in the bottom of the sea, thence will I command the serpent, and he shall bite them." [Amos 9:2-3]
As for the PCUSA allowing for gay marriage? It's indicative of their idolatry.
"For they turned the glory of the incorruptible God to the similitude of the image of a corruptible man, and of birds, and four footed beasts, and of creeping things. Wherefore also God gave them up to their hearts lusts, unto uncleanness, to defile their own bodies between themselves: Which turned the truth of God unto a lie, and worshipped and served the creature, forsaking the Creator which is blessed forever, Amen. For this cause God gave them up to vile affections: for even their women did change the natural use into that which is against nature. And likewise also the men left the natural use of the woman, and burned in their lust one toward another, and man with man wrought filthiness, and received in themselves such recompense of their error, as was meet. For as they regarded not to acknowledge God, even so God delivered them up unto a reprobate mind, to do those things which are not convenient." [Romans 1:23-28]
"The trial of their countenance testifieth against them, yea, they declare their sins, as Sodom, they hide them not. Woe be unto their souls: for they have rewarded evil unto themselves." [Isaiah 3:9]