Perhaps the rise in scientific knowledge has generally driven the role of religion down, but when you say that "Phenomena can be scientifically explained, proved & verified, without having to invoke explanations that involve the spiritual world," you should perhaps also add "... although such explanations are rarely ruled out entirely."
Also, "Invoking the name of God on complex issues (as in the dark ages) can hinder the seeking of explanations & solutions from a scientific & logical standpoint," but then it can also help motivate the search in the first place. It depends on your perspective. Are you trying to seek the explanation that rules out "God", or are you merely trying to better understand how God did things? For a long time, it was the latter that drove people, and in large part scientific progress didn't really suffer (and yes, at this point people might throw Galileo out there but it wasn't really his scientific work that put the Church off what he said).
A scientific view of the world doesn't really "need" God, but doesn't really rule it out either. You can always make room for a God in explaining things. It's a crap way of explaining things, in my opinion, but people can do it all the same. Maybe it's just because people are determined to find a purpose in life.
And besides, there are always phenomena that scientists can't explain -- or, rather, can't explain *yet*, or can't explain decisively -- and that too leaves room for the spiritual, or religious, in people's lives. That's not going to change either; we'll never run out of things we don't know.