Is a claim of 50,000,000 Baptist martyrs accurate?

In the book The Trail of Blood by James M Carroll, the author makes the claim that 50,000,000 early Baptists were martyred under persecution by the Catholic Church. The author makes the claim multiple times without any sourcing for that number. My question is essentially two parts. Is the claim of 50,000,000 Baptist martyrs accurate, and if so, can someone point me to a source that validates the claim?