There are many more differences besides just how they worship and holy days observed. I'm not Catholic and I'm not an expert on the subject, but I know enough to have questions about it. Seems like you know even lessOkay, you're the guy who didn't know Catholics are Christians, but now you want to tell me about the "major differences" between the two? Yes, I'm aware there are "differences" in how Catholics and other Christian denominations worship and observe holy days, but based on your limited knowledge on Catholics, I suggest you leave this one alone because you have no idea what you are talking about.
As usual, when religion and politics are brought up, it turns into a pissing match, so I'm out. Carry on without me.