Yes it is. Where do you think Kip McKean came from? From a mainline Church of Christ in Gainesville, Florida.
Did you even check out my link:
http://www.reveal.org
I know because I was a member of both.
He may have come from them - but the International Churches of Christ are not the churches of Christ. I think they are the ones that are the cult.
I can't help it what you have heard - we are NOT THE INTERNATIONAL CHURCHES OF CHRIST. And, I would think that we know as we are the ones attending the church.
I don't know about the mainline CoC, but the ICC do believe they are God's sole remnant on earth, as evidenced by the fact that there is only one congregation in a given geographical area. For example, there is "the Tampa Church of Christ," "the South Florida Church of Christ," "the Orlando Church of Christ", and that is the name they go by.
Kip McKean did come out of what was a mainstream church, the Crossroads Church of Christ in Gainesville, FL. When I was in junior high, there was much talk and fear of the Crossroads movement. By the time I was in college, it was called the Boston Movement and the Discipling Movement. I had a friend who moved several hundred miles away from home after college and got caught up in it. Back then there was no scientific proof that they used brainwashing techniques, but many in the mainstream churches realized they were. I could never understand how my friend got caught up in it. She was so intelligent and strong willed. Once she had a close family member die in her hometown (her brother or her grandfather), and her mentor or elders or whoever had to approve her actions would not let her come home. I spent many hours looking at reveal.org about a year ago when someone pointed me to it and wondering whatever happened to my friend. I've lost touch with her.