(As mentioned) What was demanded by Allah from the Muslims for their Iman was quite easy and straight-forward (with 6 articles of belief one has Iman, literally they have safety). For the Israelites no, they had to start from Sidq [sincerity] which is very hard, and act accordingly so that at the end they would be Qiddis (i.e. Purified of all bad traits).
But for Muslims, the default rule is that every believer is a Wali. So consider how many things Allah has overlooked for the Muslim Ummah, yet we have many nominal Muslims or people born into Islam who wish to rebel or to be arrogant- may Allah save us from this.