Once you read
Craig's response on Divine Simplicity (DS), recommend reading
Edward Feser's own response.
It seems to me that what Craig debates against in DS is a very absurd conception of it. For example, Craig "equivicates" God's characteristics saying God's omnipotence is not the same as God's existence, and to say otherwise is unintelligible. Whereas Feser reasons DS only entails God's characteristics are "analogous" in God to what we understand them to be in us. As Feser summarises in one of his paragraphs:
When we bring the concept of analogy to bear on the doctrine of divine simplicity, we can see what is wrong with Craig’s bare assertion that the doctrine is unintelligible. For this assertion has whatever plausibility it has, I would suggest, only if we think of God as having an essence, as existing, and as having power, knowledge, etc. in the same or univocal sense in which we and other creatures have these things. For what we call power in us is clearly different from what we call knowledge in us; our essences are different from our “acts of existing” (to use the Thomistic jargon); and so forth. So to say that knowledge (in that sense) is identical to power (in that sense), etc. does seem unintelligible. But that is simply the wrong way to understand the doctrine of divine simplicity. Properly understood, the doctrine does not say that power, knowledge, goodness, essence, existence, etc., as they exist in us, are identical. Rather, it says that there is in God something that is analogous to power, something analogous to knowledge, something analogous to goodness, etc., and that these “somethings” all turn out to be one and the same thing. “Power,” “knowledge,” “goodness,” etc. are merely different, analogously used descriptions we use in order to refer to what is in God one and the same reality, just as (to borrow Frege’s famous example) the expressions “the morning star” and “the evening star” differ in sense while referring to one and the same thing (the planet Venus).
I think Feser to some degree bypasses Craig's initial objections to DS being unintelligible. I'm just not sure whether there is some "watering down" as Craig claims many moderns like to do with DS.
For example, a rejoinder for Craig might be, "surely DS entails more than simply our preceiving analogous characteristics in God?" God is either omni
potent or God isn't. God is either omni
scient or God isn't. If we are just perceiving these qualities in God's essense, then let's be clear that they don't exist in God as anything other than as mere constructions in our heads. That is, God is not really omniscient nor is God omnipotent, despite our use of these lingual constructs which identify these different properties in God. Yet, if knowledge and power are
not analogously alike but different in some way, and each are found in God, then it it seems there is distinction to be seen
that really does exist in God's nature. Therefore, God cannot be simple.
At the end of the day, I don't see any devastating argument/s against God's eternality and aseity if one drops DS. Yet, I see many contortions required to sustain DS. I guess it seems obvious where I tend to lean towards (Craig's side), but the fact that the many intelligent thinkers do seem to have held to some form of DS does make me pause and remain undecisive.