I realize you don't become a Christian just by going to church. That's the entire premise of the faulty analogy. But it's still a faulty analogy because, while just going to church doesn't make you a Christian you
CAN become a Christian....you just have to do more than just go to church. In fact, that's the very argument they're trying to make with the faulty analogy. Don't just go to church and call yourself a Christian. Do all the other stuff that goes along with it.
Conversely, no matter how hard you try and no matter what you do you absolutely can
NOT become a car. The analogy doesn't work.
It should be "...no more than going to the kitchen makes you a cook".
See, that analogy works. I walk into a kitchen but that doesn't make me a cook. I have to actually get the ingredients and know how to use them.