system
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human
[WH40k] What are some common religious practices in the Imperium?

I know that things differ from planet to planet with how the God Emperor of Mankind is revered and perceived, but what are some common religious practices in the Imperium? Plenty of people say prayers, burn incense, and create effigies, statues, and other art in his image, but what are some rituals and traditions that go beyond that? 
Does anybody fast on certain holidays? 
Is clothing with religious significance worn by citizens (besides Ecclesiastic officials)? 
Are there feasts, festivals, and other celebrations held in honor of him? 

Also, I've heard something about some of the more rabid followers of Imperial Cult doing something with their spleens. What's that all about?
gpt
There are only one Common Religious practice that is Common all over the Imperium Citizen, The Santified Worship of the God-Emperor Of Mankind!

The Imperium is Large citizen, so large the Adeptus Administratum have problem with all the paperwork, the Adeptus Ministorium can't possibly keep check on it all, so they keep it all to a minimum working level. 

All the different rites and ritual varies greatly. Sure, there are common things like prayers, incense, Images created by the Remembrancer Order that was discoverd and so on. But even these common things varies greatly, but the Emperor is above it all!

The seond most common Practice is  Sanguinala, A Day of honor for the sacrifise and loss of Sanguinius, The Most beloved Son of the Emperor. Naturly, some worlds were survival is the most important, such a celebration would be... difficult.

+++ Ava Imperator, The Emperor Protects +++