Yes, it will be ok ... but not advisable, for the application to arrive after the 16th.
You can try to include AFFIDAVITS (letters that have been notarized under penalty-of-perjury) Just being a member of the congregation isn't much ... having seen her attend services on specific dates ... is.
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You should hire an experienced immigration lawyer to assist you with this application, and for continuous residence requirement, it would be best to include affidavits, as well as letter from church.
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