The Christian Churches themselves would fight against any such case being brought to declare Islam as a “non-religion” and thereby not coming under the protection of the US Constitution. They would want NO SUCH THING being decided by any government entity!
I would agree with them, too.
There is a difference - “under the law” and the US Constitution - between religious Islam as practiced with approval of the US Constitution, versus, Islam as a governmental authority, as practiced in some other countries in the world.
In the good ole USA, there is a difference between “Political Islam” and “Religious Islam” as practiced and PROTECTED under the US Constitution.
Anyone trying to practice “Political Islam” and trying to enforce honor killings or cutting off hands and feet or cutting off heads and all the rest if “Political Islam” will be prosecuted “under the law” and under that same US Constitution that protects all religious practices that don’t violate our laws.
So, they have the same right as Christians to trying and convince anyone in the public that their god and their prophet is the supreme one over all others. That’s how it works in the good ole USA.
Islam makes no distinction between its political and religious aspects.
And neither aspect allows the existence of non-believers, or the Constitution.
You know Islamic genital mutilation, honor killings, and teachings of Sharia replacement of the Constitution are going on in America, right?
Because they are.