Sadly, Mother Theresa expressed the heresy of religious indifferentism. This heresy was roundly condemned and rejected by Pope Pius IX's encyclical Mirari Vos. Also, Pope Pius XI condemns ecumenism in his encyclical Mortalium Animos. In Time Magazine, Mother Theresa is quoted as saying that she only wants to "convert a Hindu to be a better Hindu, or convert a Muslim to be a better Muslim". A true saint would not, and could not say these things!