So god and Jesus are one. So doesn't that mean if you worship God by himself wouldn't you also be technically worshipping jesus?
To answer this, I'm going to quote a good friend of mine, Kae:
If they're going with that argument, then that means that they have to be worshipping the true Trinitarian God, which means Jesus is part of Him. Meaning that they have to worship the God that sent His son, Christ, to die for our sins. Therefore that person has to accept that Christ was God and came to Earth and died on a cross for our sins. So they have to accept Christ regardless.
There is also Matthew 7:21-23, which states:
"Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but only he who does the will of my Father who is in heaven. Many will say to me on that day, 'Lord, Lord, did we not prophesy in your name, and in your name drive out demons and perform many miracles?' Then I will tell them plainly, 'I never knew you. Away from me, you evildoers!'
Also, I found the verse that I was looking for in regards to your comment of God being around before and after Jesus:
John 1: 1-14
In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning.
Through him all things were made; without him nothing was made that has been made. In him was life, and that life was the light of men. The light shines in the darkness, but the darkness has not understood it.
There came a man who was sent from God; his name was John. He came as a witness to testify concerning that light, so that through him all men might believe. He himself was not the light; he came only as a witness to the light. The true light that gives light to every man was coming into the world.
He was in the world, and though the world was made through him, the world did not recognize him. He came to that which was his own, but his own did not receive him. Yet to all who received him, to those who believed in his name, he gave the right to become children of God— children born not of natural descent, nor of human decision or a husband's will, but born of God.
The Word became flesh and made his dwelling among us. We have seen his glory, the glory of the One and Only, who came from the Father, full of grace and truth.