By definition an agnostic is a person who believes that God is unknown and unknowable. This person is tragically mistaken. God has made himself known and He is knowable.
First, God has made himself known through his creation:
“The heavens declare the glory of God; the skies proclaim the work his hands. Day after day they pour forth their speech …. There is no speech or language where their voice is not heard. Their voice goes out into all the earth, their words to the end of the world” (Psalm 19:1-4).
And again, the New Testament says: ” For since the creation of the world God’s invisible qualities—- His eternal power and divine nature —-have been clearly seen, being understood from what has been made, so that men are without excuse” (Romans 1:20).
Second, God also has made himself knowable through Jesus. The Bible says that: “The Son is the radiance of God’s glory and the exact representation of his being….” (Hebrews 1-3).
Jesus said: ” Anyone who has seen me has seen the Father” (John 14:9b).
Finally, to know God we must know Jesus, for Jesus himself said: ” I am the way and the truth and the life. No one comes to the Father except through me. If you really knew me, you would know my Father as well. From now on, you do know Him and have seen Him” (John 14:6,7).
The agnostic is mistaken. God has made himself known and by faith we can know Him as we study his book the Bible.
I encourage you to find a church or a Bible study group that will help you as you seek truth.