I'd love to discuss this with you further, but I've got to get ready for work.
I find it strange that you would agree with a scripture from Mormonism.
Is Moroni 8:18 true, or not? (God is unchangeable)?
If so and you have found a correct statement in an incorrect book, then wouldn't that statement also be suspect?
And why would you believe any statement from this source?
Perhaps it comes down to semantics. Maybe your definition of "unchangeable" is in itself changeable.
Post #39 (by colorcountry) & #40 (mine) addresses these questions.