Faith of the Heart is important I guess but aren't there any other body parts we should have faith of?

The rectoanal inhibitory reflex.

Faith of the assimilation tubules

Spleen, probably.

Bladder and colon. If you can't have faith in those, you're not gonna have a good time.

Kitten, believe in the spleen of the cards!

Faith of the gallbladder wouldn't have the same ring to it.

Sometimes I had faith in my liver.
Sometimes I had faith in my stomach.
Sometimes I had faith in my vestibular organ.

And since we are in tenforward:

Avoid chipotle if you don't have faith of the butthole.

Faith of the nephrons.

I'm praying for my liver.

It's important to have a backbone; put faith in the core of your being. Especially for inter-species negotiations and the occasional order to transport unruly cargo.

Personally, I prefer to have faith of the spiner).

If you’ve lost faith of the brain, you’re beginning to suffer from Alzheimer’s.

No. You fucking luddite.