nor does his word dwell in you, for you do not believe the one he sent. John 5:38 NIV
The Word of God did not dwell in the hearts of the Jewish leaders then, and it does not dwell in the hearts of some who proclaim that they do believe in God.
For one to believe in God, they must truly believe in Jesus Christ, who was sent by the Father to be our Lord and Savior. God loves us so much that He provided a way for us to be with Him even though we are sinners. An atonement is needed, and Jesus Christ fulfilled that need, but one must truly believe this and accept the Lord as their personal Savior and be obedient to the Lord.
Share the Good News with others. They need to know the Truth!