OK. I am still not exactly sure what you mean by "justification." Let's put this in more concrete terms. Imagine the following:
Sitting down to dinner you see three items on the table before you: a bowl of rice, a bowl of gasoline, and a coin. Suppose further that you prefer rice over gasoline. You have three choices--eat the rice, drink the gasoline, or flip the coin and let the result determine the contents of which bowl to consume.
What does the Evil Demon Argument (and all in its family) say about the rationality of each choice, compared to the others (assuming it says anything at all)?
What advice would you personally give someone sitting at such a dinner table, and why?
The Evil Demon Argument says that you don't know that it's actually those three things before you. Further, it says that you don't know that eating the rice will actually have the effects you're used to, or that your memories can be used to remember your preferences. Etc etc...
On reason, I would give no advice. On faith, I would say to have the rice.
I've raised arguments for philosophical scepticism before, which have mostly been argued against in a Popper-esque manner of arguing that even if we don't know anything with certainty, we can have legitimate knowledge on probabilities.
The problem with this, however, is how you answer a sceptic about the notion of probability having a correlation with reality. Probability depends upon axioms of probability- how are said axioms to be justified? It can't be by definition, or it has no correlation to reality.