What you believe may not be relevant in a martial encounter, but it is absolutely relevant to your effectiveness as a teacher.
How so? The teaching is about martial encounters -- so, where does belief enter into it? We're not teaching defense against fresh fruit.
Practical arts have to be taught from experience not belief, and Aikido is a practical art. Aikido is effective and people can learn to deploy it effectively. I teach people to become more effective in doing so. This is not a belief because I know it to be so from the facts of experience. What belief is relevant?