It's probably for the best that you re-roll. In general, if you can, it seems that for casters it's best to roll Agnostic. I believe that illusions are faction modifiers, so it'll only help change your faction somewhat.
To quote Loraen's guide:
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The safest bet is Agnostic. Illusion can conceal your race, but somehow all NPCs are able to divine your religious preferences regardless. Worshipers of evil gods may be killed in good cities regardless of their illusion and vice versa.
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