It is interesting that he has all of those medals on him. I've never seen an Orthodox priest with those -- I wonder if they are military medals, since generally Orthodox awards to priests come in different forms. The Russian Church has a particularly complex system of awards (gold cross, jeweled cross, palitsa, miter, etc...) that I can't even begin to understand. But none of them are these kinds of medals.
They're most military medals, I think I also saw an Order of Lenin, but not 100% sure. That's a strange medal for a priest to wear...
In answer to the question, what awakened this faith in him - was it what he witnessed or experienced during the war? The answer is - no, not even the war. He simply grew up in a religious family. He always attended church, even during those days when it was - to put it mildly - frowned upon. And despite being scolded: 'How could you, you're a komsomolets!', attending God's services became for Lev Avdeevich - Father Levan - a conscious and strong free choice, while faith became a beacon which lit his path during his entire life.