Was the spirit in the Capernaum synagogue from God or from Satan?

[TonyChanYT]

Jesus was preaching in the synagogue in Capernaum in Mark 1:

23 Just then a man in their synagogue who was possessed by an impure spirit cried out, 24“What do you want with us, Jesus of Nazareth? Have you come to destroy us? I know who you are—the Holy One of God!”

This impure spirit acknowledged that Jesus was the Holy One of God.

1 John 4:

1 Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world. 2 This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God, 3but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.

Didn't the impure spirit acknowledge that Jesus Christ came in the flesh?

Was the Capernaum spirit from God or Satan?

It was from Satan. Before Jesus' death on the Cross, Satan was happy to let the Jews know that Jesus was from God. This would encourage the Jews to make Jesus a geo-political king. That was not the goal of Jesus.

After the Cross, Satan changed his strategy. 1 John was written after the Cross. After Jesus' death and resurrection, Satan acquired a better understanding of the Cross. Then, he wanted to change the narrative to that Jesus didn't come in the flesh as the Son of God to lie to the new believers.

1 John 4:

3 but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.

This is confirmed in 2 John 1:

7 I say this because many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world. Any such person is the deceiver and the antichrist.

Was the Capernaum spirit from God or Satan?

From Satan. 1 John 4:1 was true after the Cross.