I'm not sure I agree here. The "Church" these remarks were directed to was the church at Laodicea. Of the seven Churches Christ addresses in Revelation this was one he had nothing good to say about. He chastises them greatly. The verse preceding the one quoted in the article ends by calling on these people to repent. I think a very good argument could be made that this is evangelistic.
See post 3.
I find it ironic that the author uses Jonathan Edwards as support for his argument when Jonathan Edwards used that verse for an evangelical call to Christ to unbelievers in one of his most famous works.
I agree. It's like reaching out to today's Methodist or Presbyterian Churches.