I'm trying to find a good book or study that I can use to take a class through why the local Church is important. I've found a lot of people that seem to otherwise love Christ who seem ambivalent about whether or not people are in the Church. I don't want it to be primarily polemical but focused on positive arguments (that use Scripture) to help people gain a love for the visible Body of Christ. Your suggestions are welcome. I've found a couple of books but am not sure I want to use them yet.