It's more than a little disconcerting to see ignorant assertions repeatedly offered with such nonchalant authority. As has been noted more than once in these forums ...
It is not helpful to not know what you don't know.
Funny, I've not come across assertions that the First Council of Nicaea was involved in direct determination of canonical lists, or anything of that nature. And the Voltaire story made me chuckle. As much as I find Voltaire interesting, he's not exactly a reliable source for...well...anything.
But anyways...my reading on Nicaea was always that it was more an attempt to resolve doctrinal deviations amongst Christians, particularly around questions of the Trinity, and how exactly to resolve the concepts of God, Son and Holy Ghost (mostly around whether God created Jesus, or not).
I'd be interested to straw poll casual Christians on that question one day and see how many are actually closet Arians...ahem...