Without the Ten Commandments we would have never known that we were lost. The Ten Commandments were revealed to us to bring to light that we exist in a sinful state and that we alone can do nothing about it. The Ten Commandments reveal the state of the heart and mind of everyone born on this earth.
If this situation had never been revealed to us and we had remained ignorant and in darkness, it would not have eliminated the eventuality of our eternal separation from God. We would have become eternally separated from God upon our departure from this earth simply because we did not understand.
Our Father never desired to take anything away from us by giving us Jesus. His desire in sending Jesus Christ here to die for us was so that we would not be separated from him forever. He did not want us to be in darkness forever because of the origin of something that we could not help.
Satan and his evil helpers blind the minds of every human that is born here. Principalities, powers and rulers of the darkness of this world purposely deceive us into believing that we don't need Jesus. They don't mind if we say we know God, as long as we don't speak of Jesus Christ. Spiritual wickedness in high places deceives us into thinking that we can know God without this Jesus person, who was just a prophet anyway. Evil influence leads us to see the Gospel of Jesus Christ as God taking things from us.
You say that you don't believe in Satan, evil spirits, principalities, powers, rulers of the darkness of this world, spiritual wickedness in high places, demons and fallen angels? That's part of the deception. That's the main feature of the darkness.
God is a merciful God. He made it easy for anyone to defeat this evil, spiritual army and live in eternal life rather than die in eternal death. He sent his Son, who finished it forever. All anyone has to do is acknowledge Jesus Christ of Nazareth as God's son and the only Savior that mankind has, and confess him as their personal Savior. If you have asked yourself how do I know I believe in Jesus, this is how.
Jesus willingly paid the price for something that we did not understand and could not correct. The revelation is that we have been saved by the love of our God when we acknowledge Jesus and accept him as our Savior. God has not taken from us. Through his loving kindnesses and mercies, he has given to us life and life more abundantly.
I pray that you will be brought into the marvelous light by the truth of what Jesus Christ, the Lamb of God, has done for you.