How is that relevant?
Moses led more people out of bondage than either you or I have ever met (over 600,000 men; over 2 million people). Did that prevent a few key critiques of Moses coming down in the Old Testament?
(Like how Moses struck a rock to produce water instead of more carefully following God's specific instructions.)
In the end, because of things like this, God did not allow Moses to bodily enter the promised land.
Moses & Billy Graham's track record has been both quite impressive. Neither man, tho, ever claimed perfection...for it they did, the Messiah as their Savior was irrelevant to them.
How is it relevant??? Its the Great Commission given to us all by Jesus himself. In the end it is all that matters.
Matthew 28
18 Then Jesus came to them and said, “All authority in heaven and on earth has been given to me. 19 Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20 and teaching them to obey everything I have commanded you. And surely I am with you always, to the very end of the age.”