Shahadah (Iman) Faith
"There is none worthy of worship except God and Muhammad is the messenger of God."
That's what the Islamic people believed. Their name for faith is "Shahadah " known as Iman(faith). They believed that they should only serve and obey god . They were faith to god and to his messenger Muhammad . Muhammad teached them a lot and that's how they achieved . Their only purpose of living was to serve and obey god , they didn't believe in anything else .
3 details you should know
▪️ they believed that they should only serve and obey god .
▪️ The faith is called Shahadah
▪️It's achieved through the teachings and practices of the last prophet , Muhammad