You seem to think because someone claims to be a Christian then they never have sinned. Got news for ya, that is why Christ died on the cross, because even Christians are imperfect, and needed forgiveness. The good Lord knows are am imperfect. But as a Christian I know I should try to live up to the tenets set forth for us.
This is Sam Radar, who is a youtube Christian "star"-vlogger, if you will.
Viral Christian Pregnancy YouTuber Sam Rader Had a Paid Ashley Madison Account
Much more at the link above.
Mega vlogger Sam Radar, bastion of good, pure Christian principles, has now put out a youtube video proclaiming that Jesus has already forgiven him, that his sin of being known as “Dirtylittlesecretman28" on Ashley Madison is completely washed away.... not a bit of humility to be seen in that video:
Once again, we see a "Christian" confess to something and have his wife (who looked just delighted to be there, n'est ce pas??) next to him to tell us essentially 'well, screw you, I got forgiveness, let's go hate us some gay people or other minorities or good stuff like that, amen!'.
Gotta say, "Christian" charlatans (and apparently, there are a lot of them out there) have got a good racket going, there...
Oh, and then there is this, too....
*FACEPALM*
And yes, grumpy people of USMB, this IS a current event. And it's a real story. And it's linked, more than once.

Why do you always have to attack the faith of President Obama?
You're just a racist who hates our black Christian President.
There you are, of course, quite wrong. I am not attacking a faith at all. The tenets of Christianity are really wonderful in their core.
It's the hypocrites who claim to be "Christian" and then do this shit - I attack THEM.
Hope we got that cleared up, now, assuming that you have at least a little power of discernment.
Oh, I'm quite sure that all have sinned. And Christians are especially good at it, since they perverted the real principle behind
Shevarim. Christians have totally perverted what Ad-shem actually says about forgiveness and how to obtain it. They go the easy, lazy route, all the while hating on other groups of people while proclaimed to be lily white and free of sin. They totally miss the point that any sin not committed against G-d doesn't need G-d's forgiveness first, but rather, the people against whom were sinned. Only then can true repentance - "T'shuvah" begin to happen. The hubris in that youtube video tells me that that young man has no idea in the world what real forgiveness is all about. He's not sorry that he sinned. He's miffed that he got caught. There's a difference.