Welcome to the forum SCS17.
The church trail (from docks in Deep Cove) is 1000' long, and rises 150' over that length (though more rise is closer to the shoreline). Much work has been done over the years to ease the inclined sections as much as possible, improve footing, and at least one bench added as a rest spot. The young and spry could do this 0.2 mi. in just a few minutes; the website below suggests allowing 10-20 minutes for that walk.
One of the images on the church website landing page is of the docks and first part of the trail, to give you an idea of terrain:
http://stjohnsonthelake.org/