Nobody has ever seen God the Father, nor will anyone ever see God the Father because He is spirit. But people have seen the Son of God who is God the Son Christ Jesus as He walked among us and will return.

Jesus counted Himself equal with the Father which is only possible if the Trinity is true. So God is not one Person (heresy of modalism), but 3 Persons: God the Father, God the Son, God the Spirit.

Triune Godhead existed before time and space and brought time and space into being.