Even a child could see the division between what the Galileans [i.e., Christians] say they believe and what, in fact, they do believe, as demonstrated by their actions. A religion of brotherhood and mildness which daily murders those who disagree with its doctrines can only be thought hypocrite, or worse.

Actually, it meant a great deal: a very great deal. You don't have to believe that God exists to see that a story in which God takes on human form is a very different story from one in which God creates a messenger and tells that messenger to take on human form. The Passion of the Christ is a different movie depending on whether you think the person being eviscerated is God or just some guy. Athanasius thought that it was God who hung on a cross for the world; Arius thought that it was a created being who was not God. This is not very little; this is very big. Granted, the Creeds put it in terms of Aristotelian theories about "substance" and "essence": but there isn't much sense in complaining that technical documents are written in technical language if you are not prepared to pick up a standard work and look up what the words mean.