> A relativist in essence cannot prove relativism, because that would mean there is at least one absolute truth.

Well, the only statement I make as a relativist is that I cannot be sure of anything other than the fact that I exist, at least in thought or abstraction. I don't claim that it's impossible to know or that there is no truth, only that I have been unable to ascertain those truths and I've built my life and moral system from that doubt.

Things like being sure that my body exists, my surroundings, norms and even more the dogmas of belief and faith, I can only feel uncertain about them. If I can't be certain of what I can see, I can even be less certain of what I cannot see. Although I do not claim to know any truths beyond my own existence, that truth persists and reverberates in everything I do or say, making all my philosophy be filled with scepticism. 

> I am a practicing Roman Catholic.

I've been talking with another Roman Catholic very recently. I find that it's a very interesting belief system. It's kind of like the opposite of my mindset so it's really, really hard for me to stand in your shoes and say that I could believe something so specific. I still respect your belief, though. Everybody has their own reasons to believe what they believe.

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And thank you too. :) it's always good to have some sober comments from smart people. It's always more fun like that.