But isn't that the beauty of Christianity, the desire to be in a right relationship with our LORD and Savior without a central authority saying you have to. If you're referencing the councils called by Constantine and later I would disagree. I'm assuming you're referencing the Jerusalem Council.
Mormonism is growing at an incredible rate, rate of growth does not necessarily equal truth.
They have to they're bleeding members just as fast. They really aren't growing. When people realize they aren't Christian the luster disappears and they leave. The initial draw isn't their faith, it's the decent lives they live.
I was going to mention that about the Mormons.. they present themselves in deceit using double speak.. when people finally hear the truth of what they teach many leave