The Bible tells us that God changes. If the Bible described an unchanging God then Genesis would read rather differently: “On the first day God said, “Let there be light,” and on the second day God said, “Let there be light,” and on the third day God said, “Let there be light,” and on the fourth day …”
As I said, an unchanging soul renders baptism useless. If the unchanging soul is damned, then baptism cannot save it. If the unchanging soul is saved, then baptism is not necessary. An unchanging soul in effect leads to extreme Calvinism: nothing you do can affect your salvation or damnation.
Immutability (unchanging) is a proper attribute of God. In fact, being unchanging is the very definition of God.
It is incorrect to say that the Bible describes a changing God. The Bible uses language which makes God seem more human so that we can understand Him better. This is called anthropomorphic language, but it is understood that when this occurs, it is something of “poetic license” of a kind. Think for instance, when the Bible talks about God’s “arm” or His “back” or His “head”. God is immaterial, strictly speaking, He doesn’t have arms, or a back, or a head. He has no body whatsoever. (The Incarnation doesn’t really negate this statement either.) In the same way, the Scripture talks about God changing His mind, but this is also anthropomorphic language. God does not change His mind.
How do we know that the Scripture does not intend for these espressions to be taken literally? I am sure I do not need to quote the many times God is referred to as being eternal (which means outside of time and hence not subject to change), but there are also direct referrences to God being unchanging.
James 1:17: Every best gift, and every perfect gift, is from above, coming down from the Father of lights,
with whom there is no change, nor shadow of alteration.
Heb 6:17-18: Wherein God, meaning more abundantly to shew to the heirs of the promise the
immutability of his counsel, interposed an oath: That by two immutable things, in which it is impossible for God to lie, we may have the strongest comfort, who have fled for refuge to hold fast the hope set before us.
Malachi 3:6:
For I am the Lord, and I change not: and you the sons of Jacob are not consumed.
We agree, however, that the soul, and any created thing, can change.