Let us grant for our argument’s sake that those who were born into a family that belonged to the Church of Christ (or Churches of Christ, or churches of Christ) were born into the correct church. What are the chances for that to happen?
Well, when I was born there were 3 billion people on the earth, and three million people in the Churches of Christ (with all of their splinter groups) worldwide. So the chances of being born into the correct church were: one in one thousand. The chances now are one in two thousand. The chances in the 1930s were one in seven hundred. The chances of me being born into the correct splinter group were: one in ten thousand. The chances in the 1930s were one in fifteen hundred.
With luck like that we should all be buying lottery tickets!