Islamic Creed entails those matters which Muslims believe in i.e. they affirm its correctness.
ما معنى الإسلام؟
What does Islam mean?
الإسلام هو الإقرار باللسان، و التصديق بالقلب بأن جميع ما جاء به نبينا محمد صلى الله عليه و سلم حق و صدق.
Islam is to testify with the tongue and to believe from the heart that all that which our Prophet Muhammad (sallallahu alayhi wa sallam) came with is the truth and is correct.