The Bible is the mind of Christ, and is the inspired, the only infallible and authoritative Word of God.
The reality of Satan and his present control over unregenerate man does exist.
Christianity is based upon the following:
The deity of our Lord Jesus Christ.
His sinless life.
His vicarious and atoning death through His shed blood.
His bodily resurrection.
His ascension to the right hand of the Father.
His personal return in power and glory as Lord of lords and King of kings.
The fall of man and his lost estate, which makes necessary a rebirth through confession and belief in the Lord Jesus Christ.
The resurrection of believers unto everlasting life and blessing in Heaven.