I am a big promoter of conflict, especially interesting conflict. I would like to see more than just the typical bland "Kossuth vs Istishia" and "Bane vs Torm" and "Shar vs Selune" conflicts. I would like to see inter-religion conflict as well. It can be argued that the Forgotten Realm's already functions this way even though it is not readily apparent.
I think it would be more beneficial for EfU to take the focus more away from the gods and more toward the "church." A church is a collection of individuals who have rallied around a philosophical concept, to which a deity is likely tied.
The deities on EfU, unlike in cannon, are much less active in the lives of mortals. I actually like that as it gives the PC clerics the ability to throw their own spin on things, but sometimes that spin ends up putting you at odds with the establish views of the faith.
Cannon examples:
Cult of Shared Suffering: Ilmatari heretics of this cult believe that all mortals must share part of the Crying Gods' burden in order to understand his sacrifice. They are noted for self-flagellation, kidnappings, inciting riots, and passing the suffering around to nonbelievers. Cultists of Shared Suffering have access to the Healing, Retribution, Strength, and Suffering domains. They employ the favored weapon and weapon of the deity of Ilmater. Cleric believers in this heresy must be neutral.Dark Moon Heresy: Dark Moon heretics teach that Selune and Shar are one and the same, two faces of the same goddess. Dark moon heretics have access to the Cavern, Darkness, Knowledge, Moon, Protection, and Travel domains and can use the favored weapon or weapon of the deity of either goddess. Cleric believers in this heresy must be lawful neutral, neutral, or chaotic neutral.
Risen Sun Heresy: The Brotherhood of the Glorious Sun has long existed within the church of Lathander, tolerated by other followers of the Morninglord and preaching that Lathander is the reincarnated form of Amaunator, Netherese god of the sun. Heretics of the Risen Sun take the Brotherhood's beliefs one step further into heresy, by preaching that the time of Lathander's transformation is nigh and Amaunator is about to be return. Risen Sun heretics have access to the Fire, Law, Nobility, Renewal, Sun, and Time domains. Their only option for a favored weapon is the light mace. They employ the weapon of the deity of Lathander. Cleric believers in this heresy must be lawful good or lawful neutral.
Three-Faced Sun Heresy: Heretics of the Three-Faced Sun believe that the sun is a tripartite overdeity, with aspects of dawn, highsun, and dusk. Like a spinning prism viewed from the side, believers in this heresy teach that only two of the three aspects can be "seen" at any time. (There are said to be brief instants in deific time when only one aspect is manifest.)
According to this heresy, during the Age of Netheril, Amaunator ruled as the aspect of highsun, while Jergal held the portfolio of dusk. After Amaunator faded away, Lathander appeared as the aspect of dawn, and Myrkul inherited the aspect of dusk. The Time of Troubles marked the fall of Myrkul and Lathanders brief moment of unchallenged dominance. Now, believers in the Three-Faced sun are heralding the rise of Amaunator. Some believers in this heresy suggest that Lathander will become the new aspect of highsun and another will take his place as the aspect of dawn, while others herald the rise of a new deity who is the aspect of highsun.
Believers in the Three-Faced Sun have access to Death, Law, Renewal, Sun, and Time domains. They use a light mace or a scythe as a favored weapon. Their weapon of the deity is a +1 flaming light mace or a +1 flaming scythe. Cleric believers in this heresy must be lawful neutral.
Sanctuary has been around 152 years, and lives in relative isolation with the rest of the world. It is somewhat hard to believe that overall, we have not seen some deities become twisted by heresy to fit the new surroundings. After all, not to knock a uber deity like Ubtao, but we just are not going to see any dinosaurs or jungles in the Underdark. The same goes for Lurue and her Unicorn fetish, there is little to no chance of seeing those either.
So what happens if a Cleric of Lurue comes down and basically decides – yeah, you know what? Unicorns rock and all, but rothe pwn them because they have two horns instead of one. Then he proceeds to replace her unicorn fetish with a rothe fetish.
I could see Ubtao eventually being twisted into a deity of the Underdark, having his portfolios disregarded and him favoring all types of Scalykind instead of just Dinosaurs. It could go a step further even and claim that Ibrandul is a lesser aspect of Ubtao and that they are in fact the same deity.
Or how about a Cleric of Bane making the pronouncement that there is a Sanctuary Trinity composed of three deities: Bane (who leads), Helm (who guards) and Hoar (who Judges). This could be a calculated move by the Banite to gain support from Helmites and Hoarains against the established Triad as well as an attempt to warp the other deities dogma to make it more in line with Bane and his ultimate goal.
However, at the end of the day, does it really matter? Just how much support do DM’s give to players who would prefer to play heretical clerics? Staying within the lines is fun, but it gets boring quickly unless you can take a deity and somehow make that deity your own.