relics give you BONUS xp which means its not really inteded to be there but you can have it...
i believe this is why the devs have not incorporated allied faction bonus xp... and NS getting extra bonus xp for being loners is just unbalanced.
relics where not ment to be shared, they are pure greed of the gods... so if you want to please your god, then your allie becomes a speed bump in your way to please your god.
you can live without relic bonus... it's nice, but not needed.
and this topic has been discussed before.
