i`ve read completely whole Old Testament including non-canonical parts offered by Orthodox Church, and New Testament, and Ariochrestian Evangely, and Dhammapada, and Quran.
Buddhism warns to not to say to muslims if you are buddhist and in mosque i was told that some buddhist end up in mental hopital which by myself i know seem to be a true regularity.
Catholic Church claims that things like Buddhism (and also Taoism probably) are natural religions whilst monotheism is based on supernatural revelation.