The World was created through Logos

Since I have started to study evolution I doubted even the basic definition of Evolution. Evolution is defined as the process in which simpler molecules evolve to form complex molecules over million years of time through natural selection in order to adapt the environmental conditions Here my doubt is that there are various species in the same location at same environmental conditions. This fact disproves the foundation of evolution which states that the cells evolve in order to adapt itself to the environment. But today the same location is having millions of species. What is the need for the common ancestor to evolve into millions of species at same environmental conditions. Also, we see there are similar animals and reptiles exist worldwide irrespective of vast difference in climate, temperature and geological conditions. Then how can the evolution say environmental conditions and natural selection are the main factors of evolution. IS EVOLUTION TRUE? OR MERE A STUPID ATTEMPT OF ATHEISTS TO DISPROVE GOD?