I've done some Lani Smith arrangements on the organ lately - they are pretty good. Lorenz did some years back, but they tended to butcher the arrangements and/or 'abridged' them (shortened to 4 pages from 6 perhaps) which for my rendered them useless.
We used to have a "Gospel" service once a month where I currently play. The organ there is a great one to romp this stuff on - I would do preludes (my own arrangements) on stuff like It Is No Secret, Leaning On The Everlasting Arms, and such. It was lots of fun ... but over the years, through clergy changes, some service formats get tossed by the wayside. We have a contemporary service now, but the organ is silent for that one and I play the piano in a 4 member 'praise band'.
Harold deCou had some great recordings 30 years ago of these great old hymns on the organ.
Today's Christian music is better suited for the piano ... but that could be because the church acoustics are deader than a doornail and it sounds too choppy. All those wierd syncopated rhythms and tempos good me up all the time.