All people have sinned against God and are separated from Him:
for all have sinned and fall short of the glory of God,
God in His justice punishes sinners
For the wages of sin is death,
We cannot save ourselves
For by grace you have been saved through faith; and that not of yourselves, it is the gift of God; not as a result of works, so that no one may boast.
Romans 6:23 b
but the free gift of God is eternal life in Christ Jesus our Lord
In the OT, the way God declared someone could be cleansed from their sin was to sacrifice animals. God accepted that as an atonement (exchange) for their sins. God then sent Jesus to be the perfect ultimate sacrifice for sin… God provided a new covenant with man that if we believe in Jesus and receive Him as our sacrifice we will be cleansed from our sin and able to enter a relationship with Him.
The next day he saw Jesus coming to him and said, "Behold, the Lamb of God who takes away the sin of the world!"
Jesus is the only way we can come to God and have a relationship with Him. God provided Jesus because of His love for us.
"For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life."
"He who believes in the Son has eternal life; but he who does not obey the Son will not see life, but the wrath of God abides on him."
Jesus said to him, "I am the way, and the truth, and the life; no one comes to the Father but through Me.
We must repent of our sins and make God the Lord of our life
1 John 1:9
If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness
And having been made perfect, He became to all those who obey Him the source of eternal salvation,
If you love Me, you will keep My commandments.