There are many called God or god in the Bible: Angels, Satan, human judges, Moses, and Jesus Christ. The word applies to all of them because in their capacity they are all "mighty ones". But to know who the Almighty God, the Most High God, and the only true God, you have to go back to the Bible, not a formula invented hundreds of years after Jesus, and approved by human emperors:
17 When Aʹbram was 99 years old, Jehovah appeared to Aʹbram and said to him: “I am God Almighty. Walk before me and prove yourself faultless.
18 May people know that you, whose name is Jehovah,
You alone are the Most High over all the earth.
3 This means everlasting life, their coming to know you, the only true God, and the one whom you sent, Jesus Christ.
If you want to know if Jesus considers himself equal to his Father and God, again, you look to the scriptures, specifically what he said:
John 14:28, John 20:17 (after resurrection); Revelation 3:2,12 (even in heavenly glory)
28 You heard that I said to you, ‘I am going away and I am coming back to you.’ If you loved me, you would rejoice that I am going to the Father, for the Father is greater than I am.
17 Jesus said to her: “Stop clinging to me, for I have not yet ascended to the Father. But go to my brothers+ and say to them, ‘I am ascending to my Father+ and your Father and to my God+ and your God.’”
2 Become watchful, and strengthen the things remaining that were ready to die, for I have not found your works fully performed before my God.
12 “‘The one who conquers—I will make him a pillar in the temple of my God, and he will by no means go out from it anymore, and I will write upon him the name of my God and the name of the city of my God, the New Jerusalem that descends out of heaven from my God, and my own new name.