"Faith can only be defined as belief without proof."

No, I don't think so. Faith can also be defined as belief based upon repeated worldly experience and observation. Example: I have known a specific person for many years. I have found them to be honest and reliable. I have lent them money and time, and they have always returned both in full measure. They have proven to be thoughtful, caring, and trustworthy. Accordingly...I have great faith in that person, based on my actual experience...which IS proof for me.

In a similar way, God can be found to exist, not through faith-based religious books or church-based authority structures...but through the actual experience of living Life and finding out in the process that something greater than oneself helps one out in times of trial and answers one's questions and meets one's deepest needs.

All of the above experiences can be readily had without once belonging to ANY organized religion. In fact, I think organized religion often gets very much in the way of it!