In the following, we learn some of the most famous theological proofs for the existence of God. Some of these proofs will be more scientific – such as the proof of order and design – while others more rational – such as the proof of cause and effect. In speaking of the scientific proofs we should underline that we are not speaking of empirical proofs to examine the existence of God in a lab or observatory. God is not physically perceivable and hence science must recognise its limits and its inability to observe God. Science can neither affirm nor deny the existence of God. Having said this, we must say that scientific study of the world enables us -as it has enabled many scientists – to find valid reasons and signs for admitting the existence of God.