The short answer is “Yes!”
But let’s explain why Christian’s believe that having faith in Jesus Christ and having a relationship with Jesus is the only way to the Kingdom of Heaven.
First, Christian’s have the Holy Spirit sent from God through Jesus Christ to work in us to help become more like Christ and walk with Jesus in a relationship.
If you do not have the Holy Spirit, then you are still in bondage to your fleshly desires and lusts and are NOT going to Heaven.
Jesus said “Most assuredly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God.”
You need to repent for your sin and ask for forgiveness, because you have broken God’s law and are under His judgement, you are not Good, that is moral perfection, only God is Good, so don’t try to save yourself from judgement, instead put your trust in Jesus to save you:
Jesus said “For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life.”
God loves us so much he gave his only son Jesus Christ to suffer an inconceivable torture and execution on the cross taking our punishment and death for us so that whoever believes in Him, will not perish in judgement, and go to hell, but will have everlasting joy and life with Jesus Christ in the Kingdom of Heaven forever and ever.
So we believe in Jesus when he says:
Jesus said to him, “I am the way, the truth, and the life. No one comes to the Father except through Me.”
Jesus is the only one who died for us and to the punishment’s and suffering of our sins on the cross for atonement of our sins so that in the righteousness of Jesus Christ we could come to the Father and into Heaven, and we won’t be under God’s judgement when we have faith and trust in our Lord and Saviour Jesus Christ, who died for us when he was innocent and sinless, and rose from the dead defeating death, hell, and the grave. In Jesus Christ we are victorious!
“It is appointed for man to die once, and after that comes judgement.”
Believe in the Lord Jesus Christ. You will be saved from hell, and you will have everlasting life with God in heaven!