How does one get over their bigotry against Christians?

I am an admitted bigot when it comes to Christians. I want to accept everyone, but I feel naturally distrustful and loathing around Christians because of past experiences. I've been attacked and persecuted by Christians on many occasions. But I want to preach tolerance and live in a world where Christians and Pagans and people of all faiths and philosophies can work together. How can I begin to overcome this bigotry??