All of these references and even Almighty God are benign enough that they could be referring to any divine being. They could even be referring to Allah; a suggestion that I'm virtually positive the author of this email would be appalled to hear. Given the religious population make-up of the states when these preambles were being written it would have been very easy to officially sanction Christianity at that time. With that said it's perfectly clear to me that the collective preamble authors were specifically avoiding doing just that by being respectful of the common religious belief of the state citizens but also non-committal to that belief.
The important point here is that all these preambles do is make collectively agreed upon statements to the authors beliefs in the existence of an almighty being but they do not sanction any one expression of or belief system in that being.
My personal favorite preambles are from Delaware:
"Through Divine Goodness all men have, by nature, the rights of worshipping and serving their Creator according to the dictates of their consciences.
and New Hampshire:
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