Well then, what do all the verses in the OP teach, if not eternal security?
Nothing in the OP teaches eternal security.
But he who endures to the end shall be saved. Matthew 24:13
Those who turn from Him and worship the beast and take his mark on their forehead or hand, during the tribulation will be cast into the lake of fire.
This is just one example of the many many warnings from the Apostles and Jesus in the New Testament, about turning away from, departing from, or falling away from Him.
7 For nation will rise against nation, and kingdom against kingdom. And there will be famines, pestilences, and earthquakes in various places. 8 All these
are the beginning of sorrows. 9 “
Then they will deliver you up to tribulation and kill you, and you will be hated by all nations for My name’s sake. 10 And then many will be offended, will betray one another, and will hate one another. 11 Then many false prophets will rise up and deceive many. 12 And because lawlessness will abound, the love of many will grow cold. 13
But he who endures to the end shall be saved. 14 And this gospel of the kingdom will be preached in all the world as a witness to all the nations, and then the end will come. Matthew 24:7-14
9 Then a third angel followed them, saying with a loud voice, “If anyone worships the beast and his image, and receives
his mark on his forehead or on his hand, 10 he himself shall also drink of the wine of the wrath of God, which is poured out full strength into the cup of His indignation. He shall be tormented with fire and brimstone in the presence of the holy angels and in the presence of the Lamb. 11 And the smoke of their torment ascends forever and ever; and they have no rest day or night,
who worship the beast and his image, and whoever receives the mark of his name.”
12 Here is the patience of the saints; here
are those who keep the commandments of God and the faith of Jesus. Revelation 14:9-12
Worshiping images of other gods is idolatry.
8 But the cowardly, unbelieving, abominable, murderers, sexually immoral, sorcerers, idolaters, and all liars shall have their part in the lake which burns with fire and brimstone, which is the second death.” Revelation 21:8
Unfortunately, their will be many Christians who do not heed this warning, who have been taught the unbiblical OSAS doctrine, and who believe they can worship the image of the beast and receive his mark, or turn to Allah and confess him as Lord, yet continue to be saved.
JLB