While we wait for the fall of Iran and the change in regime to start World War 3, let's check our own Christian faith, doctrine and knowledge of Him and His words.
2 Cor 11:13-15 For such are false apostles deceitful workers, transforming themselves into apostles of Christ. And no wonder! For Satan transforms himself into an angel of light. Therefore, it is no great thing if his ministers also transform themselves into ministers of righteousness, whose end will be according to their works.
Since the fall of Adam and Eve, Satan and his fallen angels acting as angels of light have not stopped deceiving mankind to reject and rebel against God's words and commands.
During the days of Noah Satan even sent his fallen angels to marry the women of men, thereby corrupting the human race resulting in a race of great wickedness. God wiped out this entire wicked human race numbering by the millions with the deluge.
When the Law was given to Moses in great details, yet Satan used the false prophets and covetous Priesthood to deceive the Jews to rebel against His Law and prophets. The Jews loved heresies and false prophecies.
Jer 5:30-31 "An astonishing and horrible thing has been committed in the land: The prophets prophesy falsely, and the priests rule by their own power; and My people love to have it so. But what will you do in the end?"
Rich Pharisees Derided Jesus Teachings
Luke 16:13-14 "No servant can serve two masters; for either he will hate the one and love the other, or else he will be loyal to the one and despise the other. You cannot serve God and mammon." Now the Pharisees, who were lovers of money, also heard all these things, and they derided Him.
God considers money as an abomination for the love of money has destroyed the faith of many Christians sending most of them to damnation.
When our Lord Jesus taught that no one can serve both God and Money, the rich Pharisees who loved money ridiculed Him. Our Lord Jesus exposed their hypocrisy of justifying their covetousness.
However, some of these covetous Pharisees (false Apostles) found their way into the leadership alongside Paul and His Apostles.
Luke 16:15 And He said to them, "You are those who justify yourselves before men, but God knows your hearts. For what is highly esteemed among men is an abomination in the sight of God."
Earliest Heresy
Acts 15:5 But some of the sect of the Pharisees who believed rose up, saying, "It is necessary to circumcise them, and to command them to keep the law of Moses."
When faithful Christians were selling everything and put them under the feet of Apostles, this large amount of money attracted the covetous Pharisees and Scribes, who were sure to be in the leadership for they were highly educated and rich, whereas most of Jesus' Apostles were illiterate and poor.
The first heresy occurred in the book of Acts where covetous Pharisees insisted on Christians keeping the Mosaic Law, where they can justify their extreme wealth.
Since Christians who keep part of the Law will no longer be under God's grace, any sin they commit will lead them to be cursed and damned.
Gal 5:4 You have become estranged from Christ, you who attempt to be justified by law; you have fallen from grace.
Acts 20:29-30 For I know this, that after my departure savage wolves will come in among you, not sparing the flock. Also from among yourselves men will rise up, speaking perverse things, to draw away the disciples after themselves.
Paul warned of heresies and destructive doctrines by depraved, misled and rich church leaders (false Apostles and savage wolves) after his demise.
Today, Christians love the heresies and distorted doctrines from the OT and the many false Gospels, books and epistles resulting in the thousands and thousands of denominations, which have strayed from His words, truth and salvation. (Last days' church - Rev 3:14-22)