Have you seen the plans for the new building they're working on? The fact that he and his flock agree that their new building should stand out as obviously being a Catholic Church speaks volumes about where Longenecker is coming from.
Having followed the same lonely, dusty, road, I have sort of soft spot for people who pretty much "read their way" into the Catholic Church by studying the Bible and reading the Church Fathers which, I gather, is at least a part of how he came to Catholicism.
“To be deep into history is to cease being protestant”.
Cardinal John Henry Newman
Then they probably know my wife, she was the secretary there for 13 years. Father Longenecker is a good and holy priest who probably posts too much just like the rest of us. :)