Although it is very important to watch what we say, God doesn't decide who goes to hell because of our speech. Instead, our forgiveness and eternal life are based on the death and resurrection of Jesus Christ. If we trust Jesus to save us, we are forgiven. Ofcourse, that doesn't make it all right to swear. We should try to speak and do what is right.
Because of his kindness, you have been saved through trusting Christ. And even that trust is not your own. It, too, is a gift from God. Salvation is not a reward for the good we have done. So none of us can take any credit for it. (Ephesians 2:8-9)
Romans 3:14; James 3:10
Note to Parents
Many children think they are too bad or evil to be forgiven by God. If you sense that your child feels this way, he or she needs to know that God can forgive any sin. Tell your children that they are not uniquely bad - all people sin.