Today I came across an article discussing the study of Buddhism in Second Life. It seems that religion has provided a basis for governance and culture since the beginning of time. So it's not surprising to find religious activity in the virtual world. The Anglican Cathedral of Second Life has been meeting and holding services there since late 2006. They currently have regular masses and meetings throughout the week. And there are several other denominations and religions throughout the grid.
The overall plan for this world needs to consider religious activity as part of the culture and how it can support the community in Second Life. And exploring existing religious groups and activity will be an important component in the development of the plan.