Technically CF doesn't "target" anything, and only the target's controller can attempt to deny the witch so RAW I don't think you can. (but you can try to deny your own blessings haha).
As far as how I would play it, yes I'd allow each enemy unit a chance to deny the witch. If the rule were written with 6th edition mechanics in mind I suspect it'd be worded like a Maelstrom or Nova power, somthing like "automatically targets and hits all unit in the same combat".
Stern's Zone of Banishment is another one that doesn't technically "target" anything, it just goes off and affects things.
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