There are people who say Jesus was not sinless. They say He was not a perfect human being. Those who state this belief are uninformed and do not know the truth about Jesus or what the Bible says.
In the Old Testament, we see that the animal sacrifice for sin had to be without spot or blemish, which was a foreshadowing of Jesus coming to earth. However, the animal sacrifice was not perfect and could only cover sin. It could not take away sin. No one else has lived a perfect, sinless life, died for our sins and rose from the dead.
If Jesus had not lived a sinless life, then there would be no hope for any of us. Check out this teaching from Bill Wiese on this topic. {eoa}