We can't know what God, should he exist, wants or needs (what would an almighty being need from us anyway). So why would God need or want our faith in him?
Because, through a book written over 1500 years from 40 authors on three continents with no real inconsistencies, He has told us what He wants, and that He wants our faith.
And dragon fire is not as hot as lava in Mount Doom.
This is where the dogma kicks in. Despite popular belief, there are no assurances whatsoever that the Bible or any other holy book were written under any kind of divine influence. They tell us what some people at some point thought God was all about, and submitting ourselves to those believes is just mimicking the belief systems of the writers.
I could go into the specific inconsistencies but specifics don't matter, so let's just keep it general; why would any given holy book be accurate? Like religions, there are many in the world.
What makes them different from Silmarillion, to a reader that would hypothetically have no knowledge of any of the books' origins?
Besides that, quoting a statement is not the answer to the question regarding motives. Saying that God wants our faith is not the answer to the question why he would want our faith. Why is our faith so important that it would be used to define our post-mortal state?
And if you someone doesn't have faith in Him, why should He reward them with Salvation?
Dude he's an almighty being, he doesn't need our faith. What does he have to gain from faith? Does it give him kicks? Why would he be so petty as to leave non-believers hanging high and dry simply because of their lack of faith?
Let's have a hypothetic thought experiment now.
Let's say you become a scientist and manage to create a simulation running in a quantum computer, able to simulate entire civilizations of sentient minds with limited lifetime in the simulation.
Let's then say that you don't give them any
definite assurance of the origins of the simulated world and only make a few of the simulated beings write a book that
supposedly has some information about you, and then let a lot of people interpret the scriptures as they wish and preach that as your word in various cults and various meanings, and then you would expect people to still have faith in you?
Let's also say you have the ability to copy the personality matrices from the simulation and insert them into android interface or something, to give them life after their deaths.
What would you use to define who gets a new life? Would you poll the databases of each simulated entity to check if they believed in your existence during their lifetime, and if they did you would put them into that android interface so they could interact with you, and would you terminate the non-believers - no matter what kind of personalities they were?
What would you gain from the simulated entities having faith in you? And why would you use faith alone to define who gets another shot at life?
To me, it makes no sense at all. If God exists and if he created the universe and if he loves us, he wouldn't do that. If that is the only thing he requires, I don't much care about it. I'll rather take my chances than submit to a being that has that kind of priorities...
Of course, this is just analogous to Christian theology. In other religions you would also expect the simulated entities to behave in a certain way or do certain things. Which of course makes even less sense to me, but hey, that's just me.

Regarding natural selection, it seems you have misunderstood the fact that evolution IS natural selection and it's consequences to the species. What you seem to be considering "evolution" is actually
speciation, which is just part of evolution. I think some evolution critics make a distinction between "microevolution" (interspecies evolution) and "macroevolution", speciation or introduction of new major features to species. Truth is, there's no difference between micro- and macroevolution from evolution's point of view. It's all just change; speciation involves more changes through many generations accumulating in enough differences to classify two populations as different species in the end.
And like I said before, there are examples of speciation too, but obviously they are fewer than the other examples of interspecies evolution, mainly because the timeframe of human observations regarding evolution is limited and speciation is (usually) a slow, gradual process of two populations of same species becoming unable to produce fertile offspring. It takes a long time for that kind of differences to emerge in two separated populations, but there are examples of speciation, some of which are listed
here. Reading of the entire page is recommended for optimal understanding, but that's where the list begins...
There are also a few cases where mutations like polyploidia produce a new species in just one generation. Plants especially.