Apologetics and World Religions

I am going to start studying for a series I would like to do next school year teaching the high school students some healthy and nonjudgmental ways of engaging with people who do not believe but also may believe in something other than Christianity.

I came across this book called "I want to believe" by Mel Lawrenz that seems to be writing from the perspective of everyone longs for a belief in something bigger (God) than they are.

So far that's the only thing I have really come across other than a website www.str.org along those lines.

Do any of you have any thoughts or suggestions that you have come across that would be worth diving into?