Reduce passive spreading, though maybe have settlers start off with a religion (maybe only if from a state religion city?) - it's rather silly that my 100% Order Bannor found their new cities without Order (hey guys, we've been fighting off the forces of evil for centuries now... Can I have some agnostic volunteers for that new outpost we're planning, please?) And reduce chances of active spreading based on alignment. Ie. say 25% (extra? I'm not sure on the percentages for spreading) odds of failure if spreading a good or evil religion to a neutral, or a neutral religion to good or evil. and 50% odds of failure spreading good to evil or viceversa. So, corrupting the Elohim would still be possible, but you'd have to actively work for it, and still be at a disadvantage against anyone else trying to spread religions to them.