Are you asking me a question?
How do you know as a matter of fact that the massive majority living in the second half of the 18th Century in the Colonies were Christians? And what defines being a Christian in your head?
1. An impression I picked up from my historical reading, where religion and religious people and ideas were always seen as the norm at those times and in the times and places where those people came from. I think you are the first person to ever challenge me on this historical fact.
2. Barring extreme heresy, I am generally fine with self identification.