No. Only you are saying that it might be.
Does the Catholic teach against not calling any one father except our father in heaven? no.
Does the Catholic`s teach that the Sabbath comes on the seventh day? no.
Hey, I understand if you don’t agree with doctrines of the Catholic church. I don’t agree with them on plenty of things myself.
However, you seem to be trying to fit a symbol from prophecy into a pre-existing notion of what you think that symbol should refer to, rather than letting the Bible speak for itself as to what the symbol means. Don’t take that the wrong way, it’s just “confirmation bias”, and we all have to be on guard that we aren’t engaging in it, because it’s such a universal human tendency.
If the references to the “blood of the saints” meant what you are thinking, then all the reference in the Bible to “blood of saints”, “blood of the prophets”, “blood of the innocents”, etc, which are all used in such a similar way, would have to be interpreted similarly. Otherwise, you have an inconsistent interpretation and that must be due to your mistake, for God is not so inconsistent.