Interesting early pamphlet, would be great to find who the author was.

Is this pamphlet defending the brethren creeds in a peculiar way?? That's seems to me...

Perhaps you should see it as a summation of some biblical truths, presented through irony. Concerning a "brethren creed" the writer says - "Creeds and articles of man’s framing they throw overboard, and 'what saith the Lord,' is their rule."