What were the conditions behind the Glorious Revolution?
I would say that there were two main conditions that were behind this revolution. They were A) the fact the England had been a Protestant country for most of the past 150 years at that point and B) the fact that Parliament had come to have a lot of power in the country's political system.
When King James I came to the throne in 1685, both of these conditions caused problems to arise. James tried to take power away from the Parliament so that he could create a more powerful monarchy. He also tried to make England move towards Catholicism. When he and his wife had a son, the succession of his dynasty seemed secure and Parliament decided he needed to be overthrown.