Seems pretty clear to me that this means I can put a religious symbol anywhere I want. Whether its a nativity, an upside down cross, a statue of Buddha, or the that Six Armed Hindu one. We just have to have equal rights for all.
By your logic I can put a 10 foot tall dildo on an elementary school's front lawn.
other than stuff befalling jailbroken devices
This is the important part. Walled gardens are inherently more secure, it has nothing to do with Apple's competence.