Gingrich was born at the Harrisburg Hospital in Harrisburg, Pennsylvania, on June 17, 1943, as Newton Leroy McPherson. His mother, Kathleen “Kit” (née Daugherty; 1925–2003), and father, Newton Searles McPherson, married in September 1942, when she was 16 and McPherson was 19.
Appears his mother was possibly Irish Catholic - so he is returning to his roots.
His bio father was likely Scottish Presbyterian but did not raise him.
http://www.houseofnames.com/mcpherson-coat-of-arms
Maybe his adopted father (Gingrich) was the Lutheran???
Newt’s conversion is between himself and God.
His grandmother was Lutheran...