If there is a God, and He has lovingly created a beautiful environment for us to live in and enjoy, doesn't it make sense that He would want us to know Him?
If He wants us to know Him, doesn't it make sense that He has made Himself plain and not hidden Himself?
If He has made Himself plain, doesn't it make sense that we can observe our world and learn about Him that way?
Since our world is so amazingly beautiful, doesn't it make sense that He is amazingly beautiful as well?
Since our world is incredibly detailed, wouldn't it make sense that He would be very particular about the way in which we may know Him?
If our sin is so offensive to Him, doesn't it make sense that He would have to take extreme measures (the cross of Christ) in order to save us from it?
If there really is a Satan, wouldn't it make sense that he would do anything within his power to keep us from his enemy, our God?
If there really is a truth, wouldn't it make sense that the enemy of God would distort it in so many different ways so as to confuse us and misguide us?
If our eyes can be so easily fooled by optical illusions, is it so unreasonable to think that our brains could be fooled by an extremely intelligent, deviously crafty spiritual creature?