Why doesn't Les criticize any one denomination?
He avoids criticizing any one denomination because he has found good, Word-teaching churches in various denominations. Rather than pushing a particular local church, he encourages people of any background to look until they find one that teaches the Word as they feel it should be taught.
Les explains that when he refrains from pushing the local church, it is not because he is against the local church. He is careful that people might be admonished to get involved in a church that is true to the Book. Many churches tonight are not, but he cannot help that. He is not criticizing any one group in particular because he has found good ones in various denominations. Consequently, he tells people of whatever background to simply look until they find one that teaches the Word as they feel it should be taught.