Prabhupada taught that Krishna consciousness—God consciousness—is different from what is generally called “religion.” Taking up the practices of Krishna consciousness is not the same as converting from one religion to another. Hare Krishna devotees never say they converted from Christianity, Judaism, or some other faith. Prabhupada came not to make converts to Hinduism, he would say, but to give genuine spiritual knowledge..
This function of installing the deity is authorized. Several times I have given the example that when you put your mail in a box on the street, because it is written there “US Mail” you know that it is an authorized box. And if you put your letters within this box, they will surely reach the destination. The post office will work. So there is no difference between the huge post office building and that small box, because it is authorized.