[ars]

> is that apparently the metric system was opposed in the US based on religious reasons.

As you will discover people often use religion as an excuse for things they anyway want to do. Usually they are people who only pay lip service to their religion.

Someone didn't want to use Metric. Religion doesn't actually have anything to do with it.

> That is mind-boggling.

It shouldn't be. I assume you are surprised that religion is involved in this, but actually it is not. If they were Atheist they would have the same objection, just using different words.

Basically you need to distinguish between people being people, and people acting in a certain way because of religion. This is an example of the former.