Great questions. Here are two passage from the gospels that may help
One of the scribes came near and heard them disputing with one another, and seeing that he answered them well, he asked him, “Which commandment is the first of all?” Jesus answered, “The first is, ‘Hear, O Israel: the Lord our God, the Lord is one; you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.’ The second is this, ‘you shall love your neighbor as yourself.’ There is no other commandment greater than these.”
Mark 12:28-34
Philip said to him, “Lord, show us the Father, and we will be satisfied.” Jesus said to him, “Have I been with you all this time, Philip, and you still do not know me? Whoever has seen me has seen the Father. How can you say, ‘Show us the Father’? Do you not believe that I am in the Father and the Father is in me?
John 14:8-12
In the first, Jesus very clearly says that God is one. No Christian believes that there are three Gods.
In the second passage, Jesus teaches his disciples that he and the Father are one. To see Jesus is to see the Father.
Elsewhere in the Bible, Jesus is described as the image of the invisible God. Nobody can see God in all his majesty directly and survive. So God revealed himself in Jesus by being born a baby and living as a man. Jesus bridges the divide between God and humanity.