We were discussing tenets of faith, but even your example is not kept secret like Scientology is.
It was silly for a poster to try to compare Scientology and Mormonism as both being “secretive”.
Sorry; it's not SILLY at all.
The LDS organization has SECRETS it keeps from those considered unworthy.
Even the worthy ones are commanded to keep secret the things they have been told.
The organization tries to varnish that fact over by calling the secret things SACRED.
I'm sorry if this makes unworthy outsiders suspect your religion just a wee bit; but Hey!; that's how us humans tick!