They are different ways of acquiring knowledge. You are correct that many early scientists were Christians, but if you examine their thought in detail you will find that they believed God set up the laws of nature and let them run.
Science and revealed religion depart every time science finds evidence that conflicts with someone's interpretation of scripture.
The earliest major example is Galileo's demonstration of the moons of Jupiter and his argument that the earth revolved around the sun.
In the early 1800's, decades before Darwin, geologists abandoned the argument for a single, world wide flood. By the end of the 19th century, the earth was assumed to be hundreds of millions of years old.
How a religious person deals with these conflicts is a personal matter, but the conflicts exist.
That would be ideal, but as it is we have a very large part of the population who continue to cling to the past. Using god or religion to explain the unexplainable is something I can easily accept, but I also understand that as we become more knowledgeable the list of wondrous things god is responsible for will forever dwindle as we advance our understanding and knowledge of the universe. I'm sure most scripture made sense at the point in time it was written but it is not timeless and it is in our nature to seek the truth of our past and explore the unknown even if it disproves all we were taught. Where in our ancient past would we be now if our ancestors withheld all technology that could passably be used to contradict scripture?