Ple-Sen
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There's definitely a connection to faith. Most likely, the bonuses are calculated something like this: +4 to resistance if faith equals X, and +1 to willpower for each unit above X. But there might also be some hidden potential bonuses if faith is extremely high. Either way, out of the remaining players, only you might find it worthwhile to read this book, but even then, the bonuses are very situational. They're not useless, especially for someone whose skills don't offer many bonuses to these parameters, but I'm not sure they're worth the money or the action points. The Valkyries will definitely have better bonuses.