“And there appeared another wonder in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads.” Revelation 12:3
The above quote is only one of numerous mentions that dragons get in the Bible. Red is only one of the colours that dragons apparently come in too, at least in the minds of the Christian Right. Some dragons that hardcore conservative Christians believe in are green, and according to this video from the Cornwall Alliance, they have an unholy obsession with privileging nature and the environment over human beings. Here’s the link.
