:
Perhaps the E=5 bit is telling us the value for the U of sunday?
So:
E=5
H=6
R=7
A=1
U=2
O=3
U=4 (Tuesday?)
You're definitely on to something with the days of the week though, it can't be just a coincidence that it fits.
You might be onto something with the 7x7 grid with the numbers as well. I'm going to have a go at it now.
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I’m trying to catch up on this just now, and this happens to sound somewhat like a
Bifid cipher?
In terms of a grid being used to transpose a message into numbers.