There is a big difference..
If a single worshipper of a religion (any religion) commits a horrible act, its not cause of the religion, its caused by him/her alone.
If the prophet/inventer/leader of a religion commits this act, it shows every single follower/worshipper of said religion, that it is acceptable.
Muhammed set the bar for each and every muslim 1400 years ago, and ever since then Islam has comitted horrific acts in the name of allah/muhammed.
Jesus never harmed anyone, while muhammed was a murdering, hypocritic, lying, deceiving, childmolesting maniac.
Nuff said.