What is an overview of Christian viewpoints on the eternal destiny of individuals who die never hearing the Gospel?

Many individuals die never having heard the Gospel. Some illustrative examples are: pretty much everyone who was born before Jesus, individuals contemporary to Jesus but who were too far away at the time to hear about him (e.g. Native Americans and all tribes from the Pre-Columbian era during the first and many subsequent centuries), isolated jungle tribes in Africa and the Amazon, and [uncontacted peoples](https://en.wikipedia.org/wiki/Uncontacted_peoples) in general. How do different denominations across Christianity view the problem of individuals dying without ever having heard the Gospel's salvation message? What is the biblical basis in each case? *Note that this is an overview question: answers must summarise the positions of several different major Christian branches, and if possible even some of the smaller ones as well.* EDIT: I recently realized there is a decent overview of Christian viewpoints in the article https://en.wikipedia.org/wiki/Fate_of_the_unlearned . Just linking this to complement the already excellent answers to this question.