It would make you a partial Catholic, but then a member of western culture, you already are that, as are we all.
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Heh... if I'm a "partial Catholic", then the Catholic Church is mostly Pagan and a bit Muslim. I don't think that's a useful or accurate way to label things.
To continue with the Catholic example, it should be said that Catholics rarely agree with church doctrine in every detail. By becoming Catholic one would be joining a community of people with the same interests and some measure of agreement on fundamental principles.
Further, a common misunderstanding (imho) is that Catholicism is whatever somebody in the Vatican says it is. Catholic clergy are a tiny fraction of the Catholic community who have appointed themselves as leaders. They are influential beyond their small numbers for sure, but don't have the ability, or usually even the desire, to enforce a single form of belief on all members.
Catholicism is the sum total of what all Catholics believe, and more importantly, do.
You don't need to educate me on the Catholic Church. As it happens, I investigated it for several years.
In any case, I wasn't even thinking of fringe doctrines - I'd file core beliefs like the existence of God and the validity of the sacraments under "questionable" or "negative".