Again, this isn't related to his statement. Who's "they" in your comment?
Every Christian is a sinner, but that doesn't contradict: "Christianity is not a sinful religion."
This, logically, is meaningless. If you wanted to make a logical connection you could say "Every Christian is a sinner, therefore Christianity is a religion of sinners. This would be true.
You could also say "All Muslims must believe in the Koran. The Koran requires murder or subjugation of non-Muslims. Therefore all Muslims believe in murder and subjugation of non-Muslims". This would also be true.
It would seem obvious that a religion based on murder and subjugation is not a "religion of peace".