THE SON: From the time of the writing of the Torah, until the time of Christ's First Advent, God spoke through His prophets (Acts. 3:18; Heb. 1:1; etc.), a donkey (Num. 22:21-33), and angelic beings (Mt. 2:19; Lk. 2:10-15; etc.). During Christ's life here on earth, God spoke through Him (Heb. 1:2; etc.). At His Ascension, He instructed His disciples to spread the Gospel (Acts. 1:8), and as a result, we have the New Testament. So, from the Ascension of Christ, until the last book of the Bible was written, was less than one hundred years. In other words, the Written Tradition was completed in approximately 1600 years.
THE HOLY SPIRIT: The Oral Tradition, coupled with the Written Tradition, took about 4100 years. Since that time, born again believers have the Holy Spirit dwelling within us (Jn. 3:3-8; 14:17; Acts 2:2; etc.). The Holy Spirit leads believers to spread the Gospel, and to build up the Church, the Body of Christ. The Apostle John wrote, "But the Comforter, which is the Holy Ghost, whom the Father will send in My name, He shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you" (Jn. 14:26).
So, while it would appear that God has slowly withdrawn from interacting with His children, the opposite is true: He spoke from heaven; He walked the earth; and He now lives within us! To me, that is the fulfillment of the verse:
"Draw nigh to God, and He will draw nigh to you" (Jam. 4:8).