The Maryland State Archives Guide to Special Collections has a Research Guide for Maryland Religious Institutions that is a must for everyone with Maryland ancestors.This Guide is a compilation of information taken from WPA surveys, directories and records at the Maryland State Archives in an effort to have a list of all known churches in Maryland.
You can search this Guide by county, denomination or church name. Information found in this guide includes the name of the church, address, denomination, and information about the WPA Survey. In some cases you will see a hyperlink that will take you to a complete description for that collection. There are 5 types of religious records in this collection, Administrative Records, Vital Records, Financial Records, Misc. Records, and Loose Papers and Documents.
Most of these religious collections are available on microfilm because of the fragile nature of the original records.
This is not the only Guide the Maryland State Archives has, check out the Guide to Maryland Newspapers for information about Maryland newspapers.