Yes, crit healing is very possible, though crit is not a stat that you should focus on. Stats, by which I mean predominately intellect and spirit, are the only things you should really focus on. With intellect, critical healing will be naturally covered, and with spirit, regeneration of your mana will be covered.
At the level you're currently at, you shouldn't really worry about getting in to too much detail, but as long as you decide to stay Holy, it's a good idea to just stick with intellect and spirit.
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