Is Islam peaceful?

(Sahih Muslim 22)
It has been narrated on the authority of
Abdullah b. 'Umar that
the Messenger of Allah said:
I have been commanded to fight against
people till they testify
that there is no god but Allah, that
Muhammad is the messenger
of Allah, and they establish prayer, and
pay Zakat and if they do
it, their blood and property are
guaranteed protection on my
behalf except when justified by law, and
their affairs rest with
Allah.