In regards to how much of an issue our Earth's myriad religions would pose for our assimilation into the Imperium...Did the Imperium (other than the Word Bearers) physically persecute religious individuals during the Crusade (ie put someone to death for being religious)? Or did they simply 'ban' religion and foster a culture where being religious was seen as an extremely negative thing? Off the top of my head, I don't remember Oll Pious keeping his religious nature a secret, and it didn't seem like anyone gave him a real hard time about it (though I'm sure if he started proselytizing that might change)
In "Prospero Burns" the character Navid Murza is talked about as a 'believer', "The little sign of the crux he wore under his shirt, the genuflection he sometimes made when he thought no one was looking." The description shows its not just frowned on, but something even members of the Administratum have to conceal. I'd suspect folks are disappeared if they start being overtly religious, so there wouldn't be a large to-do described in any of the books. Although, the justification for Istvaan III being carpet bombed with drop pods by multiple legions was their reverting back to their original religion and rejecting the Imperial Truth.
The White Zone is for loading and unloading only. If you have to load, or if you have to unload, go to the White Zone. You'll love it... it's a way of life.
: Cigarettes in space?
: It's the final frontier, Nick.
: But wouldn't they blow up in an all oxygen environment?
: Probably. But it's an easy fix. One line of dialogue. 'Thank God we invented the... you know, whatever device.'