Reason is non-negotiable: arguing that others should share your beliefs commits you to it

Reason is non-negotiable. As soon as you show up to discuss the question of what we should believe (or any other question), as long as you insist that your answers, whatever they are, are reasonable or justified or true and that therefore other people ought to believe them too, then you have committed yourself to reason, and to holding your beliefs accountable to objective standards.