COUNTIF Adding New Reference cells

So what I'm trying to do is have an attendance sheet where attendee id numbers are put in one column and it removes their name from an absent list. This way, when all attendees have "shown up", I can quickly see who is missing.

The problem I am having is updating the master attendee list. If I need to add someone in the middle of the list (for alphabetical order sake) the COUNTIF function I am using does not add.

I am using the insert cell command to add more attendees to the list (in columns H and I), but column E will not update my "Absent" list.

I have attached pictures and a sample workbook. Is there any way to make these lists dynamic so I can easily update my Attendee and ID list on the fly?

Any advice would be really appreciated!!

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