Iowegian's statements and questions are entirely reasonable. But I can see why you are having trouble answering them.
I thought I answered them pretty well in the earlier part of the post. Read it again.
Faith is unseen. It isn't scientific. I believe God exists, though I have never seen Him. I believe that it is God who gives me the Grace to believe and I believe that it is God who urges me to pray through His Holy Spirit.