I have yet to see you solve the problem of infinite regression or how God Himself could be on a cause-effect chain of events before creation.
Animate creation is cause-effect, not moral creation, not free moral agent God.
God experienced duration/succession/sequence in His triune relations before creation. Thinking, acting, feeling presumes duration/time. God is personal/dynamic, not impersonal/static.
Your view is more philosophical/Platonic/Augustinian than truth/biblical/logical.
Infinite regression has been dealt with. Forget time/eternity for now. The fact is that God is uncreated Creator, no beginning, no end. So, God Himself has existed from everlasting to everlasting (which does not have to mean timeless, whatever that would mean for a personal being; numbers/mathematics are atemporal, not personal beings!).
If we can imagine a before and after creation, before 1 AD and after 1 AD, endless negative and positive numbers, you should be able to imagine an endless duration of existence.
Using your logic, God and time should not exist because of a supposed regress problem. Like it or not, God has always existed, so why cannot an endless measure of His existence exist. Numbers go forever in both directions. One should also not confuse instants and intervals. Zeno's paradox may make stupid philosophers argue that the arrow will never reach the target, but it does (infinitely smaller intervals, so never hit....whatever...parallels your supposed problem with time/regress).
Time is not space nor is it a created thing. If you have wrong conceptions about it, you will not be able to see beyond your nose. These issues are very technical and greater minds than me have demonstrated resolutions to your hang ups. Philosophers disagree on things, so some are more right, while others may be dead wrong despite fancy arguments. Just because you are unaware of resolutions or because I do not have the academic background to demonstrate things to your satisfaction does not mean the answers are not out there.
Atheists also throw out specious arguments against the existence of God, creationism, etc., but they are wrong and can be refuted (e.g. they think an event only has to happen once or that enough time will make the impossible possible....).