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Matthew 12 isn't trying to make the point that people shouldn't be divided. Jesus was accused of the jews for being a devil. They were saying Jesus was casting out devils by the power of the devil. Jesus explained that the devil doesn't cast out devils.

Then he explained that if he was using the power of the devil to cast out devils, then weren't the other jews doing the same?

But if he were using the power of God, then the Kingdom of God is come on the earth.

Then he says that if you want to rob a strong man, you have to tie up the strong man first. The obvious parallel is that Jesus is going into the devil's house (the earth -- the devil is the god of this earth) to rob him, and so he has to first defeat the devil.

Then he says that if you're not on his side, you're against him, and if you're not helping him gather people together, then you are scattering them.

In short -- division is not wrong. It's wrong to accuse Jesus of being a devil or working for the devil. It's wrong to work for the devil. But at no point does he ask us to align with others who are serving the devil.