Well, firstly the canon doesn't just come from the decisions of Europeans and bringing race into it is a non-sequitur. The canon of Scripture comes from the Sacred Tradition, preserved by the Church and lead by the Pope and the Bishops (who FWIW weren't and aren't just white guys), and then sealed by the authority given by Christ to the Pope and the Bishops on issues of faith and morals. The Sacred Tradition and the authority of the Pope and Bishops comes from Christ, so why should you trust the canon of Scripture? Because Jesus Christ is God and you should believe in Him and be apart of His Church because the canon comes from the Church which comes from Christ. If you don't believe in Jesus Christ or that He was God then worrying about the canon of Scripture and trying to criticize medieval ecumenical council decisions is just foolishness.
> But the core dogma of "believe specific claims of fact because they were written down in one text and not another" is bad epistemology
This is closer to Protestant dogma which tends to assert that the Church and all our beliefs come from Scripture. To slightly rephrase and expand on what I already said above, Catholic dogma is that the canon of Scripture comes from the Church not the other way around, that is to say Christ gave us the Sacred Tradition and the Apostles and their successors are what determined the canon of Scripture.
So now I've distilled a vague distrust you have in medieval and ancient sources down to a historical and empirical question. Did Jesus Christ die and rise again, and did He found a Church that has kept his Tradition alive through the centuries and alive fundamentally unchanged. These questions have been ignored and then ridiculed by empiricists but I've noticed more and more people starting to take them seriously, I suggest you do too.