Humans do not have to sin, though it is in our nature (Romans 3:23), except for Christ Jesus (1 Peter 2:22).
Cloning of humans is definitely a serious (mortal) sin.
No animals do not sin humans sin and it would be better for us to act like them although that is not the best way to act.
Yes, definitely. That is why Christ died, so that we could have forgiveness. Humans sin everyday, all day. Yes, sin began when God punished Adam and Eve after they ate the forbidden fruit.
As long as humans are here, never.
check somewhere else.
The song "Monster" by Skillet refers to the Monster (Sin) inside humans, and how we cannot do anything about our sin.
It is the sin all humans are supposed to carry because of Adam disobeying God's will. (The correct term is Original sin not eternal sin) edit: If by eternal you mean unforgivable then the answer is that there isn't one. All sins may be forgiven.
Humans' find it easy to sin at any time - before or after confirmation. Do your best to at least stay with in the law at all times.
Adam and eve
Mankind lives in a fallen state because of the original sin of Adam and Eve. But since all who ask are forgiven of sin by Christ Jesus, sin does not "build up" into violent events. The hearts of men are sinful by nature. God knew this was true. He knew that Adam and Eve would sin. Terrorism is just more of the same old sin that comes from the hearts of humans. It is not the result of sin. It is not a punishment for sin.
No. Humans cannot be sinless while they are on earth. Those that are believers will be sinless when they get to Heaven. But No. A human cannot go more than a day without sin.
Sin is something that can only occur on earth, and is something that Christians believe all people have committed. In heaven, there is no sin, because it is God's kingdom and only those without sin can enter. Christians also believe that because of the Fall of Adam and Eve, all humans are born with an inclination toward sin, that they will lose when they go to heaven, so they will not want to - nor actually sin.