"Fire of God" would be "Ignis Dei'. In certain circumstances (specifically, Ablative case) you could have "Igne" instead of "Ignis", but Deus is Nominative only.

My Latin is too rusty to say whether Dominus Sacratae is declined correctly. I'm not certain what meaning you intended. I want to say "Sancitified by the Lord", but that would be "Sacratus Domino"
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Regards,
Eric Fretheim
Assistant Prep Leader, 2015 October NaNoWriMo Prep Challenge

"It is perfectly okay to write garbage-- as long as you edit brilliantly." ~C.J. Cherryh

“No, writing 50,000 words in a month is normal. You are not crazy. This is not insane.” ~Teri Brown