People tend to see the foibles and weirdness of others much easier than they can their own. It is easy to judge what seems different or strange, and very difficult to hold up a mirror and look critically at yourself. But when people do, they tend to find that the things that bug them about other people are the very things that they don't like about themselves.

Religion is an extreme example of this. People are so familiar with their religion and so surrounded by a tacit acceptance and support for their particular brand of belief that they can't see how bizarre and psycho it looks from the outside. All religions look kooky to someone who wasn't raised to believe in them. The Bible is filled with things right out of fantasy and which some Christians go out of their way to denounce Harry Potter and Tolkien for... like giants, talking serpents, dragons, flaming chariots, and a whole hierarchy of non-human beings with sometimes violent and inscrutable agendas. The delineations of the various species of angels alone is enough to raise some eyebrows... seraphim, ophanim, cherubim, anakim, archangels etc. Most people don't seem to really realize what exactly they claim to believe in.

Ask most Christians if they actually believe in a race of giants that were the offspring of "the sons of god and the daughters of man" and who became the first kings (Genesis 6:2-4). That these giants (also called nephilim) survived the flood (without Noah's help) and lived in large numbers until modern times. When the Israelites came back from scouting the Holy Land they reported that the land was filled with giants, who had huge cities with towering walls, and that they felt like insects next to these people. If you believe every word of the Bible is true, than you are believing some fairly fantastic sci-fi stuff yourself, and are in no real position to laugh at Scientologists, Mormons, Moonies, or Hare Krishnas.... IMO