That’s great, but non-negotiable for what? For their ministry perhaps, but salvation?
Under Salvation, the clear statement is: “Simply through believing the good news that Christ died for his or her sins and then rose from the dead, a person can be forgiven of all sin, declared righteous by God, reborn into new life, and guaranteed eternal life with God”
Can’t get any clearer than that.
But you can't believe that simple belief without the belief of the divinity of Chirst and the Trinity. I've made it clear enough that I do not believe that any works that I do or do not do have any impact on my salvation. That said I know I have not burned anyone at the stake for any belief. There are Christian churches that have done so.