Do you believe their claims absolutely 100%
Here a refutation of the book of Chiniquy:
philvaz.com/apologetics/Charles-Chiniquy-Anti-Catholic.htm
*Sadly, a few years later, Chiniquy committed a series of acts of immorality and other unfortunate wrongdoing, which ultimately led to his excommunication from the Catholic Church in 1858. The reasons for this excommunication are discussed, in detail, in the essay Pastor Chiniquy (by the same Rev. Sydney Smith, quoted above).
*
AN EXAMINATION OF HIS “FIFTY YEARS IN THE CHURCH OF ROME” by REV. SYDNEY F. SMITH, S.J.
AN ESSAY ORIGINALLY PUBLISHED IN 1908
IF the person who called himself Father Chiniquy had confined himself to the ministrations of the religion for which he forsook the Church of his baptism, we might have left him unchallenged to give his own account of the motives and circumstances of his alleged conversion. But inasmuch as he has sought to gain popularity and income by wholesale misrepresentations against the personal character and beliefs of those with whom he was previously associated, and his books written for this purpose are still widely used as instruments for the persecution of poor Catholic working men and working women in the shops and factories, those connected with him can have no complaint against us for submitting his past career to a searching examination, even if the result should be to discover facts not tending to exalt his reputation. So far, indeed, we have not taken this course, the difficulty of obtaining the requisite information from distant places having been so great; but so many piteous appeals have reached us from the victims of this unscrupulous persecution, that we have seen the necessity of putting the man’s story to the test, and through the kindness of some American and Canadian friends we have been supplied with some materials which, if they do not enable us to check his story at every point, suffice at least to show that he was not exactly the witness of truth.
In his earliest biographical effusion, published by the Religious Tract Society in 1861, he bases his conversion solely on doctrinal considerations, and so far from bringing charges against the moral character of the Catholic clergy, he says expressly that there are in the Church of Rome many most sincere and respectable men, and that “we must surely pray God to send them His light, but we cannot go further and abuse them”; nor is there any charge against their personal character in his Why I left the Church of Rome, which comes next in chronological order. But it would seem that the ultra-Protestant palate required something more stimulating, for in his verbose and voluminous Fifty Years in the Church of Rome (1885) he tells quite a different story.