@Landon2LBCF Again, we use "unreached" for people groups only. And we make distinction between people groups with exposure to any form of Christian message (orange category) and those with no (or very little) exposure to Christian message at all (red category).
@Landon2LBCF Joshua Project collects 2 data points about Christianity: 1. Anyone calling themselves Christian and 2. Evangelical Christians (as a subset of #1).