Didn't Yo-Yo Ma perform a private concert at Steve Jobs' house? I think it was in the biography.
Just found out that he performed at the memorial service though.
Which is kind of an insult to Yo Yo Ma.
I can't imagine anyone taking this as an insult. If that person exists, I hope I never end up in the unfortunate situation of paying them an incredible compliment.
If you're ever in the position to give someone a hyper-superlative complement, you could simply use one of the many hundreds of constructions that don't involve doubting the skill of the recipient.
Edit:
Further, I don't believe in God but I also don't believe I've ever felt I deserved "full credit" for an achievement in the way you're describing.