What are the "core" beliefs of Islam outside of the 5 pillars?

What are the beliefs of Islam that are shared across all (or 99.9999%) the varying sects, not including the 5-pillars? Coming from a Christian perspective, we all (mostly) share the same scriptures but we vary on interpretations. However, the Christian beliefs that Jesus was and is God, that he died to pay for the sins of mankind, and that a person placing their faith in Christ will make them holy before God are shared between nearly every culture and denomination. Only a small fraction of controversial self-titled Christian denominations believe outside of this. Islam has a holy text and varying interpretations, but what would the set of core beliefs be for Islam?