Is Satan behind the division of the many denominations that we find? Or, is it the Lord? Denominations that contradict one another, and claim inspiration from God. How can they be?
The spirit of Satan certainly is involved but I believe God has allowed this for good purpose. Satan cannot overpower God and so anywhere Satan is able to accomplish anything it has to be that God has for good reason allowed it. And I believe that good reason is to sift hearts so that those who really do care about God's righteousness are helped to see what is really in their own hearts.
We are to hate false doctrines and anything which is a lie, for the devil is the father of the lie. But we are to learn to have fervent love for one another.
When we are faced with each others differences of beliefs, some of those beliefs quite disturbing depending upon our way of thinking, it presses us to make the decision of what we will hate. And we learn about our self by what we find our self hating. Do we hate falsehood? We are supposed to. But do we allow another person's falsehood to move us to hate that person? We then have a problem in our self which we need to attend to, and the differences of beliefs which God permitted to be stirred up helped us to learn of that need. Being aware of that we can take steps to adjust our thinking so as to perfect our love in God's image further.
Of course, there is a balance to that which if we do not have, that lack of balance also hinders our image of God. Psalms 11:5 "The LORD trieth the righteous: but the wicked and him that loveth violence his soul hateth."
It boils down to the following:
Matthew 10:34 "Think not that I am come to send peace on earth: I came not to send peace, but a sword."
Mark 9:49 "For every one shall be salted with fire, and every sacrifice shall be salted with salt."
Luke 12:49 "I am come to send fire on the earth; and what will I, if it be already kindled?"