The son is the reflection of his glory and the imprint of his person... (Hebrews 1:3).

This means that, just as the son bears the image of his father, Christ bears the image of God. And just as the son resembles his father in character and nature, so Christ resembles God in character and nature. As such, to know Christ is to know God. In fact, Jesus said that he and the Father are one (John 10:30).

Therefore, when we look at Jesus, we see the very nature and character of God. When we seek to know Jesus, we seek to know God. And when we follow Jesus, we follow God. So let us fix our eyes on Jesus, so that we may see God's glory and reflect his likeness in our lives.
So, to know God, we must know Jesus Christ. That, at least, is what is meant by this verse. Christ is the imprint of the person of the Father. God made it possible for us to know who he is through Jesus Christ. So knowing Jesus Christ is enough to know who God is. No one has ever seen God, but the Son is the one who has made him known to us (Matthew 11:27).

In prayer, only the name of Jesus Christ can be invoked. If a prayer is addressed to Jesus Christ, it is addressed directly to God. As is God, so is Jesus Christ. It's the same person we pray to. Jesus Christ is the physical manifestation of the invisible God.

Jesus Christ is the Word of God who created all things. The Word was made flesh (John 1:1). Through him, the universe was created. He is the Creator God. But the universal Church represents this flesh, also called the body of Christ (1 Corinthians 12:27-28). So, to be a member of the Church is to be in Christ, and to be in Christ is to be in God, that is, to be a child of God.

God bless you abundantly!

Pasteur Clémentine