I suppose it depends on whether you believe salvation is an act of God or an act of man.
There was a time, many years ago, when I enjoyed listening to Billy Graham. it seemed to me that the older he got the more liberal he got!
It doesn't have a thing to do with that OR....it has to do with we're not the judge of the truth of someone else's salvation...GOD is. We can see the fruit, if it's there, but even when people are truly saved there's not always a great deal of fruit if they stay infants in the Lord and do not grow.
I know plenty of people who were saved but because of the calls of the world quickly drift away from the church and back into the world. If the church does not stay faithful in trying to bring them back in soon you can't tell if they're Christians or not. Doesn't mean their salvation experience wasn't real though. Our daughter is one of those people. Thank the Lord after many hours spent in prayer for her she has returned to the Lord, was baptized and has become active in her church, growing in the Lord. But what if we hadn't constantly prayed for her? What if she'd never returned to the church, started reading her Bible? Would she be any less saved?
I do agree that the older Dr Graham got the more liberal he became, but that doesn't negate the years of faithful work He's given to God and the blessings his ministry has brought to the world over the years.