Why The Need For Christ’s Sacrifice!

Can A Christian Qualify To Enter The Kingdom Of God?

John 3:16 For God so loved the world(mankind and his potential), that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

Question!

Can one called of God actually qualify by their works and righteousness to be worthy to enter into the Kingdom of God? Can anyone else by their badgering, emotional and spiritual blackmail or threats or harassment with the Word of God drag you into the Kingdom of God?