"Islam" means "submission" - to the will of Allah. This can be achieved through peaceful means or through the sword. Hence the namne "Saif al-Islam" - "Sword of Islam". The Arabic word for peace is "salaam". Don't confuse "islam" with "salaam". So a "muslim" is one who has submitted, or who has been submitted, to the will of Allah.
Iraqi MP: Iraq may soon request Russian help against ISIS (Reuters)
from the article: Libya-sponsored aid ship originally headed for Gaza enters Egypt port