Being a teacher, being good and being god are separate things, someone could be a bad god or a bad teacher or both or be a good god but a bad teacher or a bad god but a good teacher, so the assertion that Jesus is God and therefore good doesn't hold up, it's a non sequitur.
You believe God is good because God is good and that's bad faith because you're not willing to question why you believe it, in your mind I suppose that makes you devout but to me that makes you dangerous.
“Anyone who can make you believe absurdities can make you commit atrocities.” - Voltaire
Throughout history people's unquestioning faith has been used to make them do horrendous things, things that under any other circumstances they would consider unconscionable, but they did it because bad faith blinded them to their own conscience.
"Deus vult" / "God wills it"
Whom giveth men the authority to speak for God?
Who giveth men the right to ignore the testament and kill in God's name?
"The devil can cite Scripture for his purpose. Is like a villain with a smiling cheek, A goodly apple rotten at the heart: O, what a goodly outside falsehood hath!" - William Shakespeare
I'm not saying you can't have faith but if I believed in God and a devil I'd be extremely wary of practicing bad faith because I can't imagine any greater delight for the devil than fooling people into sin in God's name.