Did Calvin and Calvinists after him see sanctification as a path toward spiritual oneness with God?
That would depend upon what you mean by spiritual oneness. Remember that for Calvin, the basis for both justification and sanctification is what he calls the 'mystical union" with Christ. But there are ideas of oneness that would acceptable and those that wouldn't. He also talks about the "exchange" in which he takes our sins and we take his righteousness. This exchange is not just a legal fiction; it's based on the union with Christ.
It's debatable whether the fire of purgatory is a literal fire, yet the theme of purification after death is common in the early church fathers, who based it on their reading of Scripture.
As far as I know, Protestants generally believe that we will be purified after death. There's no detailed teaching on how, and most people seem to assume that it happens at once. Even the Catholics now classify some of the previous ideas as speculation.
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