God did not send humans down to earth. God's Word said He created man and placed him in the Garden of Eden. We are not being punished for Adam and Eve's sins against God. They chose to sin. However, when they did that, sin then entered their spirit and in turn, separated them from God the Father's Spirit. That meant their offspring were also separated from God, having that same spirit. And on down the line, so that's why it is said thst people were born in sin.
God did not create sin nor give them sin. Sinning was their choice, alone. And they passed that on to their children through birth. That is why we see all this evil in the world, which tells us why we need Jesus. To forgive us of our sins, so that we can be reunited with our Father in heaven, in Spirit. This was not God's fault. He made Adam and Eve sinless, but it was them that decided to disobey God.
Disobeying God is called sin. Sin has to be erased by Jesus or there is no forgiveness of sins:
Hebews 9:22 "Without the shedding of blood, there is no remission (pardon/forgiveness) of sin."
This is what it says in God's Word and that is why we believe as we do, regardless of anyone else. It was not God's will that any perish. But now that Adam and Eve had sinned, God provided a way for men to escape hell, through His son, Jesus, that whosoever believes in Jesus as Savior, shall not perish, but have everlasting life. John 3:16
Jesus was not forced to pay for our sins with His blood. He volunteered, because that's how very much he loves us. Jesus came to save mankind. If His goal was to PUNISH us, He would not have died on the cross, to SAVE us from our sins. Common sense.
