Upper_Krust
Legend
Can I ask what the point of listing all the gods with a CR is for? Is the point to be able to fight them and take their abilities like in 1e where we had a party be able to kill the whole pantheon and become gods themselves. Is it to fight them on the home plane and destroy their 'avatar' only to have them reappear in their domain. I can see the CR along the lines of what some are listing if the PCs cannot truly kill gods, but would think they should be a lot higher if these are the stats to outright kill them.
Howdy aco175!

Determining the CR for different ranks of deities is useful when a DM wants to incorporate that deity into their campaign as a possible adversary for very high level or epic level PCs.
Note that the various official 'Monster' books already have stats for multiple deities. So where possible I always like to parallel the official rules.
In my 3.5E Ascension pdf I showed how Players could become deities and indeed through defeating gods steal a portion of their power.
Typically a god could only be permanently defeated on their home plane where they are at their most powerful (though there are some epic spells and cosmic monsters that can kill a god outside their home plane).
If we take the example of a CR 30 (Greater?) god, then in a straight fight its possible that a well honed party of Level 20 PCs might triumph. However, this fails to take a lot into consideration.
1. Gods are (historically) more powerful on their home planes/home realms.
2. Gods typically have hundreds or even thousands (if not millions) of servants on their home plane and many of those may be individually tougher than any single one of your PCs. The notion that a deity will simply fight a party on their own is completely ludicrous.
3. A deities realm will likely have certain traits and effects in place that further advantage the god and their followers.
So while a Level 20 party may well defeat Orcus as officially detailed, there is no way they would ever face him alone and likely no way they will be able to fight their way through his most powerful servants. Have a look at my 4E version of Orcus to see how I detailed his most powerful servants:

Article: Orcus Revisited
The Orcus entry was updated on the 11th of March. There have been two official takes on Orcus in 4th Edition (Monster Manual and E3: Prince of Undeath), but none of them created truly satisfying op…
As a general rule of thumb I'd say if the PCs challenge any deity in their home realm that god will be backed up by at least one of its more powerful servants for each of the PCs and that doesn't even take into account the PCs would still need to defeat several tough encounters to even get near the Throne Room.
Personal power will be increased while on their home plane, though exactly what that means in terms of powers and CR I am still mulling over.