The Quran spends some time saying that God does not have a son.
The Hebrew scriptures show that there is someone called the son of God who will rule all nations. Psalm 2:1-12; Proverbs 30:4
Moses, Isaiah, Ezekiel, Daniel and Micah were among the prophets who foretold his appearance. They were detailed and specific about their descriptions.
The Christian Scriptures identify that one as Jesus Christ, who fulfilled promises made to Abraham, Jacob, Judah, and David.
No other prophet and no other man fulfilled all of these prophecies right on time.
So the possibility that Jesus is not the Christ and the Son of God who will return to fulfill the final prophecies about the kingdom of God, is absolutely certain, and the certainty of these truths completely outweighs the possibility of "what if" something else is true.
He himself said “All the things written in the law of Moses and in the Prophets and Psalms about me must be fulfilled.” (Luke 24:44)
19 For the Son of God, Jesus Christ, who was preached among you through us, that is, through me and Sil·vaʹnus and Timothy, did not become “yes” and yet “no,” but “yes” has become “yes” in his case.
20 For no matter how many the promises of God are, they have become “yes” by means of him. Therefore, also through him is the “Amen” said to God, which brings him glory through us.
(2 Corinthians 1:19,20)
Up until the time of the end, all of God's promises and his prophecies about the coming Messiah or Christ, all of them, were fulfilled in Jesus. And the current conditions in this world indicate that the prophecies set for the future will take place.