To say God created death is to say God created nothing.
Death = nothing? Nope. Death is a process, like any other. It has a sequence of steps, all but one of which occur during life, and only the last process step results in the consequence of the end of mortal life, but not the end of the spirit's life, which dosed not ever die. That which is nothing is, literally, ex nihilo.
No, infinite regress is impossible. We can talk of hypothetical things in certain realms of knowledge like mathematics being infinite, but those are only analytical and not real
Who says infinite regress is impossible? Non-infinate thinkers, that's who. Show me God's claim that infinite regress is impossible. Otherwise, that's as silly as claiming, today, the geocentricity of Earth relative to the universe, let alone to our solar system. That's just egocentricity. What is unreal about analytics? Are you claiming thought is not real? That's just ex nihilo, as well. Creation [or, rather, organization of chaotic matter and energy] is what makes thought reality.
Also, a thing is what it is. that puts a limit on it. Also, matter is limited by how it is organized. That puts a limit on it. We are limited by what we are meant to do (you cannot do everything in a lifetime). We also have only two parents and come from one place ultimately. That is a limit.
I grant that thinge have limits. But, no thing [an "it" grammatically] is a living presence. All living beings [including plants] are eternal by regression and progression. They will always exist. They will change forms [for example, from spirit matter to physical matter] by form-changing which is not a limitation. Life is not limited but by its form. I will never be a rose. Neither a rose, me, or anyone else. And our parents both have parents... and so on, and, therefore, that is not just one place, nor one set of parents.
"There is no finish line."
I agree, and agree with your conclusion that the period is a finish line. But, relative to life, the statement is true. As I said, our life included for changes, but no living being has an end, ever. There are milestones, but they are merely a marker on the path, but do not define the entire path.
"Who designed the Designer?"
Concurrent with what I said previously, a father-figure Designer created God, our Designer. And, conditio0onal on worthiness for understanding how to apply the Design Rules, we ultimately become Designers, ourselves.
When We speak of God we speak of absolute, perfect and complete Being itself.
And as I mentioned before, what makes us think God's level of performance is absolute -
All-Perfect, All-Knowing, All-Powerful and All-Loving. That means He is not God.
Who decided to limit God like that? We did? ROFL How do we, imperfect, incomplete, et al, beings decide to limit God, even by description of being "all-whatever," which implies he's at an end of his progression. We blind ourselves, and God to limited progression. Limited regress, too. How did we decide we had the authority to make such a claim? God calls himself "Eternal" and that implies an ever-sharp pencil. I believe him. And I believe in my own eternity and everyone else's eternity
[note the absence of the period]