Christianity to me is a personal journey and the church(whatever denomination you belong to) helps you along that journey by completing the sacraments and praying to God
The Bible is the greatest book of all time and has all of the secrets of the world, the Christian is to study and known the Bible to help them on their personal journey with God.
"Christianity" is the name of the people who go through this journey with God throughout their lifetime, granted some churches are bad and only want money but the heavy majority are good and will help you along the way
All Christian communities need to commit to Jesus's teachingsĀ