I think I am with Peter on this one. The presence of 'Battle Magic'
amongst Heortlings is implied in the Flesh Man write up for the
homeland. I assume that most people are of this world, and do not
concentrate and do use common magic. Sure all Heortlings initiate,
and as pointed out, probably most to an Allfather cult (Adventurous
and Theunderous seem to be much more for warriors and holy men) but
I don't believe that most concentrate thier magic and drop their
common magic. Sure multiple initiation is one way to be skilled for
many roles, but that seems more unusual, dividing yourself among
divine patrons. More likely that you would get additional helping
magic from Flesh Man or another common religion. Now we could
postulate localized Flesh Man variants with magics from specific
ancestors local spirits and daimones. That might be one way to go.
But I raised the prospect of alternative common religions among the
Heortlings precisely because Flesh Man seems to monolithic for them
and I envisaged a wider range of common religions.
In addition there is an MGF in giving the players some local color
in their common magic, and providing them a range of magical skills.
YGMV.