Let's define some terms:
rational: consistent with or based on or using reason;
irrational: not consistent with or using reason;
anti-rational: opposed to the use of reason.
There is nothing in Mormonism that requires or promotes either irrationality or anti-rationality. Quite the contrary: in my experience, Mormons tend to be rational and practical.
Then RATIONALIZE how you have man-made doctrines controlling the things you do in your Temple Rites.