Until today, I never heard of that book, even though I was Baptist for the first 38 years of my life. I know my family, all of whom in earlier generations were and are Baptist, never heard of it either. They are very strictly sola scriptura and consider anything that is outside the Bible as the mere opinions of others.
Baptists I know tend to believe that they follow the norms of early Christians, but they are only looking through the prism of the King James Bible, the version with 66 books. I was headed home one day when an Atlanta radio host, a Protestant seminarian, had a caller who claimed that he could easily trace the Baptist faith to the Apostles. That was the first time I ever heard anyone claim that, but the radio host quickly shredded that statement.
I would opine that anyone believing this weak scholarship would be close to the farthest extreme and would never be representative of a significant number of believers.