Meh. I'm a Christian, and if I made a conscious decision to indulge in passive-aggressive conversion strategies in my holiday let I certainly wouldn't leave The Power of a Praying Wife lying around. I've read it in the past, it's not misogynistic twaddle about being a good little wifey - it's about wanting good things for your dh, and there is a whole series - praying husband, parent etc - but it's just a bit twee, really. I imagine it got left in a drawer by mistake.
Tbh if I was the owner I probably wouldn't leave a book with psalms on as a visitor book as I'd want to be careful to make it a welcoming place for all, without people made to feel uncomfortable. Children's Bible in with other books - meh.
I was in a holiday let once where there were a load of books about fishing on prominent display. They neither offended me or converted me from my vegetarianism.
I think you're a bit u. The place isn't wallpapered with images of the crucifixion. But on the other hand, I'd always be careful of other's feelings. My approach to it is if people want to have a chat with me and ask questions I'm more than happy. If not, then I don't shove it at them, for that is insensitive. However, not sure this can be seen as shoving it at them.
And yeah, the penis thing is a bit tired, really, in the realm of sky fairies and spaghetti monsters.