God can be discovered through religion, and even without any religion. An good example of Non-God based religion is Buddhism. It teaches you to see reality even without mentioning God. When you clear your inner mind and understand the Reality, you will discover The Real. Even God can be discovered by Science alone. You can study Astro-Physics, Theory of Everything, Quantum Physics to discover the magic and miracles hidden inside this creation. Thus you can truly realize the verse or Quran that says 'Everything surely declare the Glory of Creator'