catholic or presbyterian

So here I am two days away from joining FAPC (http://www.facp.org/). I've taken the new member classes and I've also read lots of information on reformation. I can honestly say that I'm protestant in nature (the philosophy behind questioning the bible and the Catholic church with its hundreds of traditions and politics, that hunger for understanding) although I was raised Catholic my maternal grandmother. I never had thought of signing up for membership of a church (building and congregation), but I feel at peace and at home (spiritual home, shelter). The concept of home is feeling good about being in a dwelling with others. Hence a spiritual home is where an individual may not only enjoy the companionship of others but also where the individual may grow spiritually. This whole experience has been strange, but now a question lingers. Am I Catholic as my grandmother brought me up or Presbyterian for the Sunday worship that I can enjoy and really be a part of?

volunteering

This means to give something of oneself to the benefit of another. Within this concept, we can give our time and effort to help others or for society (public goods and services). Within the boundaries of a church, to volunteer means helping in church activities, some of which help other individuals. At FAPC, the latter includes (but not limited to) a twelve-bed men-only homeless shelter, helping these folks get back on their feet and a meals program (similar to meal on wheels). I've volunteered in two of these services because something tells me to do so, not planning or thinking about when agreeing to help out. It's weird that I give my time for this having been cataloged as a selfish asshole much too often. Then again I also volunteer for my local and union.