Since there is no statements or evidence that they were asked to renounce Christ, what's the problem? Do you know what the formula for conversion to Islam is? It's repeating the 5 pillars of faith 3 times. That's it. Conversion requires a change of heart, do you really think these guys converted to Islam in the truest sense of the word? I don't and I'm willing to bet they don't either.
Don't confuse converting to CHRIST with converting to Islam. Two VERY different things.
I just thought that islam and Christ were mutually exclusive. Like I said, I would hope to have the courage to have my head hacked off than even pay lip service to a false ideology.