The Bible is a very credible ancient historical document that was copied more times than any other ancient historical document, and copied pretty accurately. Consider credibility from the scientific view of historiography, not from the personal view of individual belief. Just because many people do not believe in the Bible does not mean it is not a credible historical document, it just means it does not align with their personal beliefs or feelings.
It's interesting to me how all respectable historians believe Jesus of Nazareth existed but many think he was just teacher. However, it seems the Bible provides a lot of clear evidence Jesus was the Son of God. There are many prophecies in the Old Testament that Jesus fulfilled. Just as important, many other major characters in the New Testament also declared Jesus is the Son of God, including God (Matthew 3:17 & 17:5, Mark 1:11 & 9:7), an Angel (Luke 1:35), John the Baptist (John 1:29), Jesus' disciples (Mark 1:1 & John 1:49), the demons Jesus rebuked (Matthew 8:29, Mark 3:11 & 5:7, Luke 4:41 & 8:28), and the centurion watching over His crucifixion "Truly this man was the Son of God!" (Mark 15:39). It seems that even the devil knew Jesus is the Son of God (Luke 4:3 & 9), but phrased it as a question (if you are the Son of God), in an attempt to deceive Jesus of His identity. The devil continues to attempt this with many people on earth today.
The Gospel of John in the New Testament, was written by the disciple John, an eyewitness of the life of Jesus, and one of the three disciples closest to Jesus. John recorded that Jesus clearly stated He is the Son of God (John 6:38-40, 10:36-38 & 17:1). Either Jesus is the Son of God as He claimed, or a madman, or worse (C. S. Lewis, Mere Christianity).
All respectable historians also believe the eyewitnesses who wrote the Gospels truly believed they saw Jesus after He was raised from the dead, including the skeptic Paul (a past Pharisee) who became an apostle and wrote many of the books in the New Testament.
God sending His only Son, Jesus, was the most impactful way our sins could be forgiven (Romans 5:19 & John 1:17), showing the love of God (1 John 4:8). The last verse in the book of John makes it clear... "These are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in His name" (John 20:31).
The Bible also calls out the devil as a tempter (Matthew 4:1-11), the father of lies (John 8:44) a deceiver and accuser (Revelation 12:9-10). The devil's primary lies and deceptions are, that God doesn't exist, Jesus isn't the Son of God, and that he (the devil) doesn't exist. You can find the devil's strategy and tactics in the Spiritual Warfare OPORD.
Hundreds of years before Jesus was born Isaiah wrote a prophetic word that a virgin will bear a son (Isaiah 7:14). The angel Gabriel came to Mary and told her that she would bear the son of God and call him Jesus (Luke 1). Then an angel appeared to Joseph in a dream and told Joseph the plan (Mathew 1). Jesus was human as the Bible tells us that He got angry a few times, He had a sense of humor, and He cried a few times. Jesus fulfilled the law for us and redeemed us from our sins and gave our souls eternal life, as the Lion of Judah who faced down death, and as the ultimate sacrifice, the lamb of God. I also find it interesting that the Islamic Quran claims angels told Mary she would bear a son from God and would call Him Jesus (Ali 'Imran 3:45-47).
God gave humans free will and a spirit of power, and love, and a sound mind (2 Timothy 1:7). He also gave us dominion over the earth (Genesis 1:28). Since the fall of Adam and Eve, our desires of the flesh are against the desires of the Spirit (Galatians 5:17-26). While our flesh is a concern, we are also in a spiritual war (Ephesians 6:12 & 2 Corinthians 3-5) in the world with the devil, our adversary (1 Peter 5:8 & John 10:10). In this world we will have trouble but take heart, Jesus overcame the world (John 16:33). The world will not be set right until Jesus returns, then there will be no more tears or pain (Revelations 21:4).
The Bible tells us the devil's strategy is to steal, kill, and destroy (John 10:10), which I believe includes stealing our fruit of the Spirit, fellowship with each other, and freedom (addictions), then he attempts to kill the body, and destroy legacy. The Bible also tells us the devil's tactics of temptation (Matthew 4:1, Mark 1:13 & Luke 4:2), lies (John 8:44), deception (Revelation 12:9), and accusations (Revelation 12:10). The Bible also gives us a strategy, Jesus Christ is the way, the truth, and the life (John 14:6), submit to God and resist the devil (James 4:7). Our tactics include spreading the Gospel and baptizing (Mark 16:15), disciple others, baptize, and teach others (Matthew 28:19-20). The Bible also tells us what our armor is and what our weapon is... "Stand therefore, having fastened on the belt of truth, and having put on the breastplate of righteousness, and, as shoes for your feet, having put on the readiness given by the gospel of peace. In all circumstances take up the shield of faith, with which you can extinguish all the flaming darts of the evil one; and take the helmet of salvation, and the sword of the Spirit, which is the word of God, praying at all times in the Spirit, with all prayer and supplication" (Ephesians 6:14-18). The Spirit is our offensive weapon and it is wielded with our tongue. The power of death and life is in the tongue (Proverbs 18:21). Confess with your mouth that Jesus is Lord and believe in your heart that God raised Him from the dead and you will be saved (Romans 10:9).
Some claim that because Jesus said He is the only way to heaven that Christianity is not inclusive. Jesus never excluded anyone. In fact, the most memorized verse in the Bible is John 3:16, For God so loved the world, that He gave His only Son, that whoever believes in Him should not perish but have eternal life. The key word being "whoever." If someone does not believe in Jesus that doesn't mean that Jesus excluded them, the invitation is always there.
I hope this was helpful in providing more information about how Jesus is the Son of God.
There are guarantees in life, including change, challenges, opportunities, and choices.
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With grace and truth, the better our lives will be.
Individually and collectively, apply them and see.
With courage and caring, the more we know.
Individually and collectively, employ them and grow.
Through technology comes power.
Through humanity comes love.
Both are needed to rise above.