When you want to make a sacrifice or perform a ritual to a God you would have to make preparations for it would you not?

You couldn't just slap 5 candles down on the floor and say "For my God!"

The more elaborate and in line with the dogma the ritual is, the more this god would likely pay attention to it and the leading cleric/followers get perks. That said, one ritual is rarely enough to garner the support of a God in normal circumstances, more a pattern of faith and belief and devotion to the faith that will bring about extra blessings.

edit to add this: This is not however an indication to kill lots of people in PvP to have more weight with this diety. Rituals can be done without it. All PvP should be done carefully and within the guidlines set by the server DMs.