Clearly there is some good-making feature the universe has that God lacks, or else God would not create the universe at all. Basically, God would only create a universe if it instantiated some new good-making property.
However, if God is perfect, then God must have all good-making properties ***already*** in order to be perfect. If he lacks some good that only an additional creation can provided, then he cannot be perfect prior to the universe.
The argument in formal form:
P1. If a “Perfect Creator” exists, This Perfect being created a new good-making property by creating the universe
P2. If a “Perfect Creator” exists, God could not have created a new good-making property, as one must have all good-making properties already to be Perfect
C. A “Perfect Creator” entails a logical contradiction (God created a new good-making property, but God cannot create a new good-making property).
However, if God is perfect, then God must have all good-making properties ***already*** in order to be perfect. If he lacks some good that only an additional creation can provided, then he cannot be perfect prior to the universe.
The argument in formal form:
P1. If a “Perfect Creator” exists, This Perfect being created a new good-making property by creating the universe
P2. If a “Perfect Creator” exists, God could not have created a new good-making property, as one must have all good-making properties already to be Perfect
C. A “Perfect Creator” entails a logical contradiction (God created a new good-making property, but God cannot create a new good-making property).