1. The Lamb of God is a title referring to Jesus as the perfect and ultimate sacrifice for sin. Our punishment in hell for sin is eternal. And an eternal punishment needs an eternal sacrifice. Who is eternal that can take away the sins of the world? Jesus The God, who is eternal.
And the notion that the title 'Son of God' indicates inferiority to the Father is based on a faulty conception of the phrase "son of..." Meant among the ancients. Though the term can refer to "offspring of" in some contexts, it also carries the important meaning "of the order of." The phrase is often used that way on the Old Testament.
For example, "sons of the prophets" meant "of the order of the prophets" (1 Kings 20:35). "Sons of the singers" meant "of the order of singers" (Nehemiah 12:28). Likewise, the phrase "Son of God" means "of the order of God," and represents claim to Undiminished Deity.
The ancients used the phrase "son of..." To indicate likeness or sameness of nature and equality of being. Hence, when Jesus claimed to be the Son of God, His Jewish contemporaries fully understood that He was making a claim to be God in an unqualified sense.
From the earliest days of Christianity, the phrase "Son of God" was understood to be fully equivalent to God. This is why, when Jesus claimed to be the Son of God, the Jews insisted, "We have a law, and according to that law he ought to die because he has made himself the Son of God." (John 17:9).
Recognizing that Jesus was identifying Himself as God, the Jews wanted to put Him to death for committing blasphemy (Leviticus 24:16). Also, the "Son of Man," title Jesus constantly refers to Himself as refers to His Divinity as God.
It is as a reference to the prophecy of Daniel 7:13-14, “In my vision at night I looked, and there before me was one like a son of man, coming with the clouds of heaven. He approached the Ancient of Days and was led into his presence. He was given authority, glory and sovereign power; all peoples, nations and men of every language worshiped him. His dominion is an everlasting dominion that will not pass away, and his kingdom is one that will never be destroyed.”
The Son of Man has All authority and ultimate Power, where everyone WORSHIPS Him, with an ETERNAL Kingdom.
2. Yes Jesus was a prophet like Moses, but It didn't LIMIT Jesus to be just that and nothing more. Moses spoke, "Thus says The Lord," while Jesus (in His OWN Authority) said, "Truly, I tell you." Moses asked God to perform miracles. Jesus just made if happen in His OWN authority. Unlike Moses, He didn't pray to God for a miracle when He calmed the storm, or healed the blind, or made the lame walk. Jesus was a prophet unto Moses, but to say that's all He was, is limiting who He actually demonstrated Himself to be.
3. The Greeks didn't need to know about the Granville Sharp Rule as it was invented by them in their own language
4. You say there were others before Jesus who saved Gods people. That Jesus wasn't the only savior.
Tell me, could any of them besides Jesus save us from sin? Could any of them offer themselves up for the sins of the world? Saving a nation like Israel is one thing, and many people in the bible did that. But none could save anyone from sin. ONLY Jesus is THE savior Above All others.