The first amendment doesn’t define what a religion is and your opinion won’t change that. A billion and a half Muslims think it’s a religion as do millions of non Muslims, even the Pope.
So I think you better do better than that.
How would you change the first amendment so that it would exclude protection of “religions” such as Islam?
The First Amendment would be amended as follows:
“Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof, except that Islam is hereby deemed not to be a religion and is not afforded the protections of this Amendment or any other provision of law.”
How hard is that?