I don't blame him for looking for a church that is likeminded. Many would consider that a very important doctrine to be in agreement on. Having a doctrine you don't believe thrown at you every other service, or being belittled because you aren't a pre-tribber doesn't exactly evoke feelings of unity.
I came across these a while back:
http://www.endtime-truth.com
http://www.truth-not-tradition.com/articles.html