There are numerous instances in the Bible where the apostles professed that Jesus was God. You have one example already where Peter professed that he was the Christ. Some others: After the resurrection Jesus appeared to all but Thomas and Thomas doubted. At this next appearance when Thomas was present, he offered the wounds to put his hands into and Thomas replied, “My Lord and my God”. When Christ first described the Eucharist he asked the apostles if they too wished to leave and Peter professed that he had the words of eternal life, clearly a reference to his divinity. When John and Andrew first mentioned Christ to Peter, they claimed to have found the Messiah. There are many other references as well. Also, look at the Acts of the Apostles where they lived their faith after Christ ascended into heaven and read what they preached, some to the point of being killed. Lastly, if you look at the writings of the early Church fathers (those who were contemporaries of the original apostles or one generation removed) you will see that they universally believed in Christ’s divinity (although there were some early heretical beliefs about the exact nature of that divinity).