Here's an idea. A variable level PrC specifically for becoming a diety designed much in the manner as the [animal] Lord, King/Queen of the [environment], or [foe] hunter classes. In short a customizable PrC, which has the entry requirements based on the portfolio and domains in which they wish to have as a god. From the portfolio and domains the character wishes to have you assemble the entry requirements, and each item in their portfolio/domain access would give it's own bonuses.
This could explain why gods tend to have very limited portfolios/domains, and why some gods continue to gain and lose power as time passes. The more encompassing one's portfolio the more time they must spend to make it to godhood, which in turn limits the competition for higher gods, while allowing access to lesser deity (or quasi diety).status upon a larger percentage that would be happy being any kind of god.
This could explain why gods tend to have very limited portfolios/domains, and why some gods continue to gain and lose power as time passes. The more encompassing one's portfolio the more time they must spend to make it to godhood, which in turn limits the competition for higher gods, while allowing access to lesser deity (or quasi diety).status upon a larger percentage that would be happy being any kind of god.