Most of the Hindu temples in North America have Shiva, Vishnu, Devi, ganesh, mahavir jain, Iyyappa, and some I do not even understand.
So what? They want it that way. but should not insist that all temples in USA must follow what they have done. If some temples allow patrons to enter with shoes on that is their rule and others must not complain.
Our dharma permits building of temples for various gods by various sections of people and does not force that everybody becomes ford model T. The wish of some to put all in one vessel and make a 'jail kaLi' will not work.