the simple answer is sexual selection, just as music is part of mating of many animals, especially birds.
See "Review of Sexual Selection and Human Evolution"
Department of Psychology | The University of New Mexico
3.3 Selection for aesthetic displays
Some traits have been shaped as aesthetic displays, sometimes in addition to functioning as indicators. Aesthetic displays play upon the perceptual biases of receivers to attract attention, provoke excitement, and increase willingness to mate. That is, seducers manipulate perceptions. The perceptual biases open to manipulation can arise in two, often complementary, ways: (1) they may already exist as `latent preferences' side-effects of previous evolutionary processes, reflecting basic psychophysical effects, general principles of perception, or perceptual adaptations to particular environments and (2) they may co-evolve with the courtship traits they prefer, through Fisher's runaway process.
There are other references available as well.
Sexual selection could also be the reason for our larger brain. Notice that a lot of courtship occurs on dance halls to music and that performers, especially singers are held in high regard, more so by those of prime mating ages.
enjoy.
ps - your argument reduces to "I like music, I like to explain things as being done by God, other than that I have no evidence for my concept."
we are limited in our ability to understand
by our ability to understand
Rebel
AAmerican
.Zen
[Deist
{{{Buddha walks off laughing with joy}}}