[Lutheran being the original and the largest Evangelical group....]
In the Lutheran Church, all Christians, on earth but especially in heaven, are regarded as saints. The opening poster is a Saint. Pope Francis is a Saint. Billy Graham is a Saint.
However, Lutherans often use the term especially to refer to HISTORIC figures (whether Lutheran or otherwise) whom the whole church on Earth has customarily, traditionally and especially held up - perhaps as worthy of being our model of Christian life. Christians, historically, ecumenically, have looked up to them in a sense. Lutherans have liturgical calendars in which are "feast days" to honor individuals as saints in this sense.
But here is no dogmatic check list here, it's simply by historic, ecumenical
consensus.... and has no particular theology attached to it, as it they received more love than me or you, or EARNED salvation more than you or me, or NEEDED Jesus more or less than me or you. Simply people of great faith and life, worthy of our learning from such.
In our very modern world, most don't have "heroes" anymore....people we lift up.... people they tell their children to grow up to be like. Too bad. Such can be helpful, even if they are flawed, even if they are human (in fact, being altogether human CAN in some ways make them better examples; we mere humans thus can do the good they did). When I was a Catholic boy, many such examples were held up to me. And I'm grateful.
https://www.youtube.com/watch?v=Idq2LCQJ2dc
.