Mountains are a part of the design of the earth. They recycle earth materials, produce new land, provide barriers to air currents that bring us water, and provide minerals essential to our existence. From a believer's standpoint this is all a demonstration of God's planning and design. The atheist might prefer to see it as a natural consequence of the existence of a terrestrial planet. We may disagree on the cause, but the purpose is clear.
Mountains have mystic properties and religious significance .
All religions have used mountains. Virtually all giant telescopes have been built on top of mountains. In the Bible there are numerous cases where things happened or were carried out on a mountain top. Moses went up on Sinai. Abraham and Isaac were on a mountain in Moriah.