alljustsquirrels, did you go to a US public (state) school or a private one?
I went to public school in New York, and my experience was very different from yours.
In high school, I had a Western Civilization teacher who was removed from teaching my honors class because he was accused by some parents of "teaching the bible in class."
What really happened was that he had us read the section of the New Testament where Jesus talks about how "the meek shall inherit the Earth", etc., and talked about how hypocritical that was considering Christianity's role in things like the Crusades and the Spanish Inquisition. I would not call that teaching students the bible. But he was demoted from his job anyway because of it.
I was also taught scientific method in the early grades and the difference between a scientific theory (based on repeated observations and experiments), which is what scientists mean when they say that evolution is "theory", and the word "theory" as it is commonly used.
We vaguely touched on different religious beliefs in Social Studies, just as part of learning about different cultures.
I also never heard of Creationism or Intelligent Design till after I left school. I graduated from high school in the 1980s; I think those terms probably weren't invented yet.
ksand24, I think my education was a lot like yours, except we didn't have separate RE classes; we learned about other religions in Social Studies and didn't go into anywhere near as much depth as you probably did.