There are many men here in PA by name of William Michael and Jacob Michael, have you checked out Northumberland County website??
If you do not know how use =
http://www.usgenweb.com/http://www.usgenweb.com/ and go into the State programs (down along left side)then click on State Listings....scroll down and you'll see Pennsylvania...click on it and it will open up to our Various Counties.You'll see them listed "A" thru "Z"go into Northumberland Co.and look specifically at:
Stone Valley Church Records (many, many of them here...incl. my own lines)
If interested I'm publishing a family history.e-mail me personally for further information.