Many reformed are less than truthful scholars when it comes to their heroes and they do not so much as produce biographies as they do hagiographies. Simply put, many reformed are unreliable scholars due to an effort to white-wash their heroes.
Despite disagreeing with much of what Perg says on this thread (I for one have no problem with mandatory church attendance believing it to be required by the fourth commandment and useful for facilitating the preaching of the gospel), he is correct on this point. Carl Trueman and other historians have made similar statements as well. All too often, biographies written by Reformed writers are hagiographies and not objective accounts of their subject. This sort of thing is propaganda, not objective history. It also does not sit well with a Reformed view of indwelling sin in the regenerate.