As an engineer, I've always found the telialogical argument for a creator God pretty convincing. The fact that the universe exists in all it's complexity is NOT self justifying, the whole thing is outrageously unlikely without some sort of guiding consciousness behind it. The idea that there is some sort of barrier between us and our creator is also easy to accept. There is evidence of him all around us and remaining in us, but we just can't to see him directly. The notion that the creator would desire fellowship with us is not all that hard to buy, after all, what creator wouldn't want to converse with sentient creations? The conclusion that we are driven to is that there is something about God's nature and ours that keeps him from doing what he want's to do, fellowship with us. The Christian position is that our current nature is so repugnant to God that he withholds his direct presence from us to keep himself from destroying us on the spot in spite of his desire to be with us. Hence Christ's ministry as atoning sacrifice and the Holy spirit's ministry as transforming agent. The thrust of the Christian message is that God exists and he desperately want's to transform us into beings who can enter directly into his presence and experience his approval instead of his disgust. Because of where we are starting from this is a painful process, so the church exists to support us during the process.