When Was Satan Cast From Heaven?

I have heard the heresy that there was a "pre-existance" where the angels fought in heaven and Satan was cast out.

Listen. You can find the truth if you will know the Word. In Job Satan comes before God, and in their conversation it is revealed that Satan was still able to enter into Heaven at that time. If he could still enter into Heaven that means he obviously wasn't cast out yet.

Every single word in the Bible is SO important. If you are in a place, you do not refer to it as somewhere else. You say "here", if you are there, and not refer to it as "there".

Now there was a day when the sons of God came to present themselves before the Lord , and Satan also came among them. And the Lord said to Satan, “From where do you come?” So Satan answered the Lord and said, “From going to and fro on the earth, and from walking back and forth on it.”
Job 1:6-7 NKJV

Again there was a day when the sons of God came to present themselves before the Lord , and Satan came also among them to present himself before the Lord . And the Lord said to Satan, “From where do you come?” Satan answered the Lord and said, “From going to and fro on the earth, and from walking back and forth on it.”
Job 2:1-2 NKJV

It was when the Kingdom of God came that Satan was cast out of Heaven, and today he roams the earth with great wrath as a lion looking to see whom he may devour.

So the great dragon was cast out, that serpent of old, called the Devil and Satan, who deceives the whole world; he was cast to the earth, and his angels were cast out with him. Then I heard a loud voice saying in heaven, “Now salvation, and strength, and the kingdom of our God, and the power of His Christ have come, for the accuser of our brethren, who accused them before our God day and night, has been cast down. And they overcame him by the blood of the Lamb and by the word of their testimony, and they did not love their lives to the death. Therefore rejoice, O heavens, and you who dwell in them! Woe to the inhabitants of the earth and the sea! For the devil has come down to you, having great wrath, because he knows that he has a short time.”
Revelation 12:9-12 NKJV

When did the Kingdom come? Jesus says it was when He was on the earth it was made available.

Now after John was put in prison, Jesus came to Galilee, preaching the gospel of the kingdom of God, and saying, “The time is fulfilled, and the kingdom of God is at hand. Repent, and believe in the gospel.”
Mark 1:14-15 NKJV

“The law and the prophets were until John. Since that time the kingdom of God has been preached, and everyone is pressing into it."
Luke 16:16 NKJV

Now when He was asked by the Pharisees when the kingdom of God would come, He answered them and said, “The kingdom of God does not come with observation;  nor will they say, ‘See here!’ or ‘See there!’ For indeed, the kingdom of God is within you.”
Luke 17:20-21 NKJV

With great wrath your adversary seeks to destroy you.

Be sober, be vigilant; because your adversary the devil walks about like a roaring lion, seeking whom he may devour.
I Peter 5:8 NKJV

Know your Bible.