Why would those edicts make you doubt the saving power of Christ? Medieval Christendom wasn't a melting pot, a diverse society, or a Jacobin
egalité regime -- it was a
Christian society,
de jure et de facto. Americans who are indoctrinated with the ideals of our secular, Enlightenment, humanistic culture are apt to gasp in shock at the very idea of elevating one religion above all others, but in those days the religious and governmental authorities were unafraid to acclaim Christianity as the one, true religion. Just as the worship of the goddess Liberty is our national faith today, so was the worship of Christ in the era of Christendom, and people of that age were no more "evil" for jealously guarding the Catholic Faith than we are for guarding our freedom. Just as we treat those outside our civic religion (illegal aliens, Moslems, communists, fascists, etc.) with prudent suspicion, those who were outside of the Christian faith and culture -- not only Jews, but Moslems, pagans, and other nonbelievers -- were considered aliens, interlopers, and/or parasites, and rightfully so. To condemn them is to condemn the very idea behind every true culture: the idea of identity, of Us and Them.
Were there excesses, horrors, crimes? Yes. But the same is true of every place and time in human history; let the culture without sin cast the first stone. In any case, allowing the actions of men to separate one from the love of Christ is a mistake. Truth is Truth, no matter what men say or do, and no bishop, cardinal, or even pope can contradict anything that the Church has taught. Such teaching is sui generis error; to teach error (i.e. to contradict the established teachings of the Church) is proof that the teacher does not possess the charism of infallibility and, therefore, cannot be considered a binding authority by believers. The pope that contradicts the dogmas of the Church is not the true pope.
Why would those edicts make you doubt the saving power of Christ? Those edicts are not what make me reject the divinity of Jesus. In posting them I was replying to Dajjal, who is apparently a big fan of the Fourth Lateran Council. I thought I would provide an illustration of what he seemed to be supporting.
I reject the claims of the messiahhood and the divinity of Jesus because I read the Hebrew scriptures as a Jew. Jesus did not fulfil the messianic prophecies, and God is a unity, not a trinity. The rest is detail.