My Points Reiterated
A.) You're assuming there is a god without providing any evidence as to why there need be one.
I gave a transcendental proof of God's existence in which I stated that God is the precondition of intelligibility. In other words, without God's existence, it's impossible to prove anything in any
absolute or
objective way.
B.) You're definition of god is just your definition. You're making the assumption that a god must be eternal. You have provided no evidence as to why this is the case.
My evidence for God's eternal nature comes from the Bible (not my own personal opinion), His own divine and specific revelation about Himself. For instance, Psalm 90:2 in the Bible says, "Before the mountains were brought forth or ever Thou hadst formed the earth and the world, even from
everlasting to everlasting, Thou art God." There are many other evidences I could give, but this passage should suffice.
C.) God does require a causal explanation. If you are working on the basis of "where did the universe come from?" well then where did this god come from? If you are saying he is eternal, you are assuming that attribute. Now you must answer why his existence is necessary and why does he need to be eternal?
The assumption of your question is that God's existence
requires that He also had an origin. Asking if the universe had a beginning and whether God had a beginning are two different questions because they involve two distinct entities. As I've mentioned before, God is eternal by His own nature and character, whereas the universe is not.
Let's assume that God did have a beginning. Then one might eventually ask where did that thing or being which "created" God come from. Then that would lead inevitably to the next question of where the thing or being which "created" God come from. On and on this would go unto infinity. So, rationally, it would seem to me that there has to be a point where you stop at a first and ultimate Cause, Who by nature is uncaused. That is one reason why I said God does not require a causal explanation.
The problem I believe the average naturalist has is exactly on this point of origins in their view of the universe. What was the first thing, event, or person that initiated the beginning of all things both living and non-living in the universe? Naturalists have struggled with that question for a long time, concluding one of three things:
1. The universe came from nothing, which is simply absurd.
2. The questions of origins are non-important (and even stupid to ask), which they are definitely not.
3. No one can know for sure the origin of the universe, which is a self-refuting statement.
All faith systems in the world, including "Atheism," struggle with this issue of origins, except for Christianity. The reason this is, among many, is that the Christian religion is the only one which can make sense of how an infinite and immutable Being like God can create time and finite creatures without Himself being subject to time and the finite world.