And the First Amendment does not limit its protection of religious liberty to persons anyway: "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof." That means "free exercise" by persons AND by corporations, in whatever degree a corporation can be said to practice any values.
The same people who condemn corporations as "evil" will not admit that corporations can be "good."
There is no legal reason whatsoever that a corporation cannot claim the same constitutional legal protections as an individual.