Laughlin and Mary Powers McElyea baptised two of their children in Christ's Church, York Springs, Huntington Township, Adams County, Pennsylvania. It was an Episcopal church. I'm not an expert on religion but wouldn't Quakers go to a different church?
Do you have some list of attendees of these monthly meetings that shows the McElyea's were there?
How do you know that Cook was Rachel's last name? Do you have proof? The only marriage information I've found doesn't list a last name for Rachel.