One may look at this with the greatest doubt of the highest order but, may I indulge you to exercise some patience as you read the texts carefully. Starting from the title: “You can beat death and live forever if you believe in the begotten son of God, which is Jesus Christ". Some believers in Christian Community are void of this truth that is why they are being robbed of their right in Christ Jesus. The bible says that you shall know the truth, and the truth shall make you free John 8:32. What is that truth? It is your victory over death which God manifested through Christ Jesus before you were born and not until you know it - this fortune will be far from you.
However, death started after Adam’s Disobedience in the Garden of Eden. The reason is because according to the written word of God, it states that the wages of sin is death Rom 6:23. Due to Adam’s sin, the only thing available as his entitlement was death and death started reigning upon mankind after that manner. Moreover, the first man Adam was of flesh which is of the nature of earth after the similitude of the devil (carnality).
In those days, devil was the king of the earth and the reason why God gave Adam law was that when he fails due to weakness of flesh, the new man (Jesus) after the nature of the spirit which gives life will destroy the first order and the devil in it. As a result, death started reigning among the people, until Christ. Jesus became the only one who could do it for all because everyone was originated in him even before the foundation of the word. Eph 1:4. That is to say that our first nature which was after the flesh is only but a shadow of the original in Christ Jesus.
When Jesus died, we died with him to destroy the first nature alongside the devil while the original nature that is eternal emerges. Gal. 2:20. Since we died once, we cannot die again thereby fulfilling the word of God, that, it is appointed unto men once to die but after this the judgment Heb 9:27. Jesus came in our nature to destroy death and the devil that we might live forever Heb 2:14. Though our body takes a form of flesh, it is not but the body of spirit by faith of Christ. 2 Cor. 5:7.
One may ask where are the martyrs and the people who started the race before us, dear; their death does not change this word of God that is true. It could be that they never met with this truth because, so many things they could not teach are being taught today. What about Almighty Saint Paul? He accepted to die: “but if by continuing to live I can do more worthwhile work, than I am not sure which I should choose”. ‘I am pulled in two directions’. “I want very much to leave this life and be with Christ, which is a far better thing” Said St. Paul, Philippians 1:22-23. Jesus our master also professed identically to this: “Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life” John 5:24. Verily, I say unto you, “There be some standing here, which shall not taste of death, till they see the son of man coming in his kingdom”. Math. 16:28.
Remember, in the beginning of this text I placed a condition “if” which implies that when you don’t believe this truth - it will never manifest in your life.