John 1:18 No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him.
No man has ever seen God. When God wants to be seen we see Jesus. Jesus is God declared, God seen. Jesus is God. We know God. We know Him through Jesus and what He did on the cross of Calvary. Serving God is serving Jesus.
Now this verse will help you understand verses in the Bible when it says that someone is seeing God. They are actually seeing Jesus who is God in the flesh.