The climbers would don their Green Boots in hopes of meeting the God at the top.

If you have a wide defintion of religion, one could argue that is the case.

Because most who go (and die) there, have no fun doing it.

There are plenty of beautiful mountains, but most just want to stand on this particular mountain (sometimes after being dragged up there), because of some numbers. Not because of the mountain.

Mountaineering is literally a mountain cult (non-pejoratively) so this wouldn't even be inaccurate once you translate "religion" into anthropological terms.

Isn't it though? All kneel before consumerism, the one true God.