How is it possible for Muslims to be classified as Gentiles even if they Don't deem Torah to be corrupt and have Abrahimic Lineage?

Muslims don't believe Torah to be corrupt nor do they deny the Torah and it is considered in the six articles of faith to believe in all revealed scriptures like Torah, Psalms etc . Also Muslim share a common patriarch Prophet Moses and believe in all of the subsequent prophets like Israel etc , yet why are Muslims considered to be gentiles?