Are mutations part of the "engine" of evolution?

I find science very interesting. I was doing a lot of reading on the common mechanisms of genetic mutation. This explains how the mechanisms actually provide examples of a loss of information rather than the creation of new information necessary to explain molecules-to-man evolution.

In evolutionary theory, mutations are described as the mechanism that fuels the engine of natural selection, creating new organisms as a result. However, the vast majority of mutations are either neutral or cause a loss of information in the genetic code of an individual.

Evolution teaches that mutations have accumulated over millions of years to increase the complexity of organisms on the earth.

The Bible teaches that, as a result of Adam's sin, all of creation is in a downward slide-including the genetic information that is in every living cell.
The law against marrying close relations was not given to Israel until Leviticus 18.
Up to this point, the accumulation of genetic mistakes was apparently not significant enough to cause genetic disorders in the offspring of  close family members.

Today, with thousands of years accumulated genetic mistakes in the human gene pool, intermarriage would be much more likely to produce children with genetic disorders. So it seems that the explanation of a genetic degradation since the Cause of Adam actually fits the evidence better than the evolution model of increasing complexity.

https://www.youtube.com/watch?v=-d-J974AlF0

The Argument from Gradation (Perfection) in Things

1) There are different degrees of perfections among beings (some are most nearly perfect than others).

2) But things cannot be more or less perfect unless there is a wholly perfect.

3) Whatever is perfect is the cause of the less-than-perfect (the higher is the cause of the lower).

4) Therefore, there must be a perfect Being that is causing the perfections of the less-than-perfect beings.

5) This we call God.

Hebrews 1:1-4

In the past God spoke to our ancestors through the prophets at many times and in various ways, but in these last days he has spoken to us by his Son,whom he appointed heir of all things, and through whom also he made the universe. The Son is the radiance of God’s glory and the exact representation of his being, sustaining all things by his powerful word. After he had provided purification for sins, he sat down at the right hand of the Majesty in heaven.  So he became as much superior to the angels as the name he has inherited is superior to theirs.