So, what is needed for Salvation, to be 100% right on all doctrinal and dogmatic issues, or to have Faith?
Neither. Having Jesus. Trusting Him.
You can believe that God exists and you do well, even the demons believe and tremble.
But it doesn't save them.
If someone is putting faith in their faith to save them, it's the wrong thing. The faith has to be in Jesus, not their ability to have faith.