Most famous scientist from that era are people who went against the church,

This is a pop-history chestnut that really, really needs to die, and it's one that comes about as a result as a result of the Enlightenment. For the actual Medieval period, the Church was a great proponent of scientific education and study. It was particularly interested in astronomy, optics and natural science. Science was the means by which man could greater understand God's creation and thus be closer to God. The Church was also directly responsible for the continued existence of a variety of Classical works. We know, for example, that medical texts from the Ninth Century made reference to Celsus' de Medicina, Galen and Pliny among many others.

Many notable Medieval authors were also known by their contemporaries as much for their scientific advances as we now know them for their chronicles, histories, theology or philosophy. Bede, for example, well known for his Historia Ecclesiastica was important in the 8th Century for his work on computus, the use of astrophysical reckoning to calculate the passage of time accurately. Indeed, his The Reckoning of Time was a seminal work, in which he also made important observations on the natures of the tide. Robert Grosseteste was Bishop of Lincoln in the 12th and 13th centuries and is still widely regarded as a founding figure of the modern Scientific Method and using evidence based on repeated experiments to support a theory. He was interested in particular in optics and astronomy, but also geometry and mathematics. His De Luce (also known as On the Metaphysics of Light) was a pioneering and widely original work of cosmogony which postulated, among other things, the formation of the universe from one singular 'explosion', the formation process of stars and planets, and a universal set of physical laws governing existence, working on the basis that light was the "first form" of all things and if light could be understood through lines, points and equations, so by extension could everything else.