Jesus Christ was the perfect sacrifice for the sins of all of mankind. That is because He was totally without sin. He was the pure white, unblemished lamb of God.
But was He incapable of committing sin? Being the Son of God, was it even possible that He could sin? Or was His sacrifice merely a show?
The truth is Jesus Christ was as subject to sin as everyone and anyone ever born. But Christ, through the help of God the Father and the Holy Spirit, absolutely overcome sin, lived a sinless life - even despite all of the suffering He endured. Christ was not a showman. His suffering was genuine. His sacrifice was so great it paid the price for all the sins of mankind from Adam till the end.