Many of the "Old Time Fundamentalists" like Larkin say that Satan was cast out of heaven and down to earth in the "dateless past." But again they say that he will be cast out of heaven in the future "Great Tribulation." If that is true, who let him back into heaven so that he must be cast out again?

I find that the Scriptures roughly pinpoint the time that Satan was cast out of heaven.
It was around the time of the AD70 Roman destruction of Jerusalem and the temple.

Revelation 12:
7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
8 And prevailed not; neither was their place found any more in heaven.
9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
10 And I heard a loud voice saying in heaven, NOW IS COME SALVATION, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night.


Salvation didn't come before Christ died on the cross. Nor was the kingdom set up before. And "the power of His Christ" came at the resurrection of Christ (Romans 1:4, KJV).

Matthew 28:
16 Then the eleven disciples went away into Galilee, into a mountain where Jesus had appointed them.
17 And when they saw him, they worshipped him: but some doubted.
18 And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.

Jesus said He saw Satan fall like lightening from heaven. But He didn't say when He saw him fall. Jesus may have seen Satan fall in a vision. But the Bible doesn't say.