Jesus taught about the Holy Spirit's function to carry out God's work, including inspiring one to speak the words of God and to resist the power of Satan.
God's Spirit will never prod us to do anything that is not godly love, and because it a spirit of a sound mind, it will never motivate us to do crazy things.
Unity comes only through the initiation of God. If we would follow the suggestions in Romans 12, we could do our part in promoting unity in God's church.
Sin has tainted the most faithful leaders. Most (perhaps all) church leaders have skeletons in their closets, but we follow them as they follow Christ.