People who claim to know god, themselves can't give a perfect explanation about god. If you can't explain your faith in something how do you expect people to believe you and in your faith. Usually people use god as a way to explain things that have no explanation or certain tragic events in life that have randomly happended. People love to have an illusion of knowing everything and abuse the concept of god for it. As an example from my life, recently my aunt and my grandfather died one month apart and to that my father was convinced it was god " testing" us even though we all could clearly see through the unhealthy lifestyle of my aunt. You see how people have blindfaith and manipulate god into explaining irl events. I believe god/concept of god was created by early humans who couldn't explain things then which we can now and that mentality got carried down generations.