Many mistake freedom of speech for liberty to say anything at any time and not be subject to consequences. Not even a little child has that kind of freedom. “Watch your mouth.” Right language, like right thinking, does not come naturally. Praying in accord with the Creator, at least as He invites and teaches prayer, not an activity to be used in the interest of making political points.
That is your religious belief.
Those folks who were praying were exercising their religious beliefs. “Free exercise” does not mean we get to impose our beliefs on others. They are FREE to have and exercise their own.