I tried to take those non-Catholics to another church...
Exposure to the wide variety beliefs of others is almost always a good thing. Visiting the services of other religions while a youth can be an important element in developing a sense of religious tolerance as an adult. However, some religions are fairly insular and even go so far as to prohibit attendance by their members at other places of worship. That's a shame (dare I say paranoid?), IMO, but those tenets must be respected in the name of tolerance.
Several years ago, I presented a short progam on cross-cultural religious awareness to the troop at our meeting before Scout Sunday/Sabbath. Just a short overview of a dozen different religions, world-wide: where, what, when, etc. Most fellows were mildly interested and a few were fascinated by stuff they never knew before. However, I did recieve one or two sharp comments from evangelical Christian parents who did not appreciate my mild attempt to widen their son's perspective. In deference to that minority, I've not repeated the progam. Live and learn.