@happyme - Yes, those "Christians" mistreat everyone including other believers. The Pharisees, Sadducees, and scribes immersed themselves in Mosaic law and the writings of the prophets yet failed to recognize the Messiah Himself when he lived among them. And they were also the spiritual leaders who conspired to have Him crucified. When Jesus exhorts believers to take up the cross and follow Him, He literally means that everyone who confesses sin, begs forgiveness, and asks to be cleansed and restored to the original image of God in Christ Jesus should also follow Him to the cross according to our individual calling. Peter writes, "Make your calling and election sure." - 2 Peter 1:10

Biblical Christianity is an eternal commitment to live in Christ and to repent when we fail to do so. Neither the Crusades nor the Spanish Inquisition nor the Salem witch trials reflected the Spirit of God. Our only commandment is to love God, love one another, love our neighbors and our enemies, speak the truth in love, and leave the rest to the Father through the Son by the Spirit. That is already a great deal and much more than many of us have demonstrated.