It was created to give an excuse to have super epic cool giant tiny space knights with flaming swords n sh*t fighting demons on cathedral spaceships because it was cool to them.
This idea the game was created as a work of politician and religious satire isn't even secondary, it's like third-ary. The religious elements were there because it looked metal af. They just wanted heavy metal sci fi album covers to come to life on the tabletop. People didn't make nerd stuff back then out of spite or some politician statement about extremism and xenophobia, they created stuff just to have fun.
40k was created as a satire of authoritarianism, militarism, religious extremism, and xenophobia.
Bo is, at best, a servitor.