Are all the National Days of Prayer started by Abraham Lincoln a good thing?

I would say yes. Separation of church and state aside (not really applicable since it isn't a requirement and they don't specify how or to whom people should pray), I think that it is a good thing to ask citizens to clearly connect their citizenship with their personal beliefs. So much of the time, we focus all our attention on ourselves...our prayers (if we pray) are limited to our own needs (extended family included) and concerns and interests, our thoughts are focused on our own life. I think it is a good thing to encourage people to take a day every once in a while to focus on the bigger picture...to step outside our little world and think and pray about the well-being of our entire country. Of course, I'd like to see some "world days of prayer" too...keep expanding our perspective so that we all spend a little less time worrying about ourselves and a little more time pondering the needs of others.