Good exists - a Catholic comments

[Ahriman]

Why are ther many kinds?

That doesn’t make sense since there’s supposed to be only one god and one instruction book

Hi H
You are correct to a degree. There is only one God, and the main instruction book is the Bible. But Jesus Christ also founded the Catholic Church, the one, true Church, and gave it authority to teach humankind. 
Cheers Barry

Dude, every religion claims to be the one true faith, literally all of them. They are all so different, how can just one of them, out of all the others, be the true religion? Not plausible. I like Catholicism as much as the next guy, but to say that it's the "one true church" simply doesn't track.