This comes up, again and again, mostly because Christopher Hitchens, a perfectly impious carbuncle of a caricature of a human being used his... ahem... pulpit to make it a thing.

Mother Teresa of Calcutta was not, and never claimed to be, a perfect person. She was, however, perfectly Catholic, reflecting nearly ALL and EVERY virtue and vice of that particularly institution, to which she gave herself unceasingly, unstintingly and unselfishly. There is a courage and a dedication there that is admirable, however ironic it is that her selfless, sometimes misguided, acts, has earned for her the scorn and derision which ought be heaped upon the deep male hierarchy of the Curia through the centuries that taught her the things she believed and practiced.