[I have edited this post with an important note about my personal perspective - - not to be interpreted as universally held by too many others.]
This is an important question to ask - - because So Many people ask this:
“… why would God use millions of years and evolution to create us.”
The standard answer is the same answer Creationists use to explain why God would create his greatest creation “miraculously” out of Dust: “Our ways are not God’s ways…”
That should be good enough for just about any Christian, right?
But there is also a second school of thought, which deals with the question of why God uses something as complex as the water cycle to create rain to nourish his creation? Are you familiar with how Rabbi’s analyze scripture? They take two texts that appear to be contradictory. And they analyze very deeply and very broadly all the factors that should be considered in evaluating 2 seemingly contradictory verses.
And out of this giant accretion of analysis and comparisons, they take the most beautiful and coherent intersection of a hypothetical metaphysical reality - - which would answer and resolve the contradiction - - and they explain that this elegant and beautiful “complex” of additional premises and divine instrumentalities must be true . . . if we are to find coherence in God’s word.
What’s my point about this? Ah … through this process, the Rabbi’s not only resolve a contradiction, but they more fulsomely describe the nature of the Divine! When someone say an Omnipotent God is one that can make a rock so heavy the Omnipotent God can’t lift it … the Rabbi’s might say (maybe): that the nature of God is that he would never want to do that. And so there is no conflict: the Divine Mind of the Cosmos doesn’t even think about making a rock so heavy He/It can’t lift the rock.
And like so about rain storms. One might look at the Divine and conclude: God does not think about waving his figurative limbs about and making rain storms “poof”" in the middle of nowhere. All God thinks about is how he can manifest his agency in His Creation to accomplish his will.
So… for the mystically oriented Evolutionist, it is a short step to conclude: God doesn’t think about creating humans in 6 days, or in 1 out of 6 days, because there is no physical, no natural, way for God to do such a thing.
[EDIT - Note: this is not a statement of fact, but an optional statement of perspective. I do think God is capable of the miraculous. I personally think such actions are reserved for incredibly important and unusual circumstances.]
But He knows how he wants to make rain, and he knows that Evolution will produce he humanity he wants. Theoretically, he could do it more quickly if he says “poof” … which is the Human interpretation of Him using “the Word” to create… but only in the way someone also says “theoretically, God can make a rock so heavy he can’t lift it, and he can make a square that is a circle.”
Or, @EvanFlick, you can go to the much shorter way of saying the same thing: “Our ways are not God’s ways.”