Religion varies from sector to sector in the Guild however there is three major and huge differences.
In main Guild Systems backwater or non, all religious cults, churches and services are banned. There is no exception to the law regardless of organisation. This includes the Unity, who are told very seriously to use their embassy as an embassy not a base for preaching. It is noted that while elves can hold views on religion and have belief they follow the law to the letter and crackdowns by the GSF and TFL against religion tend to happen if that occurs.
In Coronian territory the rules are more lax than the Guild, all religious groups are tolerated (space note: will speak with mandura about this)
The Unity's territory there is only one religion representing the pantheon, and that is them. They tend to come down hard on religious items that could lead to unbalance in their systems. The Unity however has no law on other religious groups and so long as they don't try and take over the Unity respects them.