I'm afraid I can't answer your questions. The 2 churches mentioned in the article were the Grace Episcopal which is at 820 Broadway in Paducah; and the other, that Clarissa Johnston (his sister) attended was the First Presbyterian. It's located at 200 N. 7th St. in Paducah.
The McCracken Co. Library has a website. If you e-mail Vonnie in Special Collections, she may be able to tell you who you could contact in the Confederate Re-enactors group over there. I don't know any of them.
Ann