As a Jew I know some non Jews must get really frustrated, not knowing how to refer to us! :)
Seriously though, we don't mind - it's more the content of what you're saying that we're interested in!
Historically, the very word 'Jew' was defined in dictionaries to mean some pretty nasty things, which I won't repeat here. For that reason, partly, some people feel 'Jewish' is just a bit nicer.
Personally, I think all that matters is the intent behind the words. You sound like a genuine and decent person, I doubt I would be offended by anything you say :)
There are others on this site who are less nice, and whether they refer to us as 'jewish' or 'jew' the chances are they'll be insulting us!
So don't worry - but thanks for asking, we appreciate it :)