What makes you think the basis for all existence (space/time/energy) is not eternal? Why do they have to be created but God doesn't?
I think it is, but not just because the First Cause argument is persuasive that it is.
Why do they have to be created but God doesn't?
Dependent existence is the universe as we observe and explain it. That's the first part. The second part (whatever you wish to call it) follows from logic - which explains why there is any first part at all.
IMHO, the second, logic part, has remained unscathed thus far and more successful objections tend to go after the first part.