I hereby " nominate" you to dig into this.
This is a very succinct line of thinking, IMO, and one which needs to be pursued. Since he has been a minister for over 30 years, there is a possibility that his last name isn't Lawless. Churches in the 70's, etc. didn't question a man of God..
Plus, this man had a mentor, his FIL.
All I know is that the dates appear to tell a story in 1960 ONLY, when Lawless was already in his 30's. He met Connie Harris, apparently fell in love with her. Her father was a Baptist preacher. So Mr. Lawless became a Baptist on his wedding day and was marred and baptized by his FIL. ( very strange to be baptized on one's wedding day, to be honest).
Harris ( FIL) plays a huge part in Lawless's life at the beginning of what we know- his baptism, his marriage, whatever religious tutelage Rev. Harris provided..
The FIL would most certainly be deceased but the Harris family may know things about Mr. Lawless, at least about his background in 1960, when he would already be in his 30's.
I probably would start by looking into the career of Elder Harris ( the FIL, father of Connie Harris Lawless). Did he ever do any, um, community ministerial service, gently phrased?