My nine year old sister wants to get baptized, and I don't think she's accepted Jesus as her Savior. What should I say to her? Do I get her to say the sinner's prayer? I want her to say it, but I want her to mean it and understand it. But I don't know how to explain it to her. Thanks!
All one needs to do to be baptized is to believe what the Church teaches and then be baptized. Baptism can be done either by pouring water on the forehead or by immersion.
Also, it is important to know what the Bible says about baptism:
Now when they heard this they were cut to the heart, and said to Peter and the rest of the apostles, "Brethren, what shall we do?" And Peter said to them, "Repent, and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins; and you shall receive the gift of the Holy Spirit. For the promise is to you and to your children and to all that are far off, every one whom the Lord our God calls to him."
(Acts 2:37-39 RSV-CE)
Now there was a man of the Pharisees, named Nicode'mus, a ruler of the Jews. This man came to Jesus by night and said to him, "Rabbi, we know that you are a teacher come from God; for no one can do these signs that you do, unless God is with him." Jesus answered him, "Truly, truly, I say to you, unless one is born anew, he cannot see the kingdom of God." Nicode'mus said to him, "How can a man be born when he is old? Can he enter a second time into his mother's womb and be born?" Jesus answered, "Truly, truly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God. That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.
(John 3:1-6 RSV-CE)
This is only two verses of the many in the Bible which speak about Baptism. Baptism is a Sacrament and it washes away sins. I know that non-Catholics do not believe in Sacraments. However, baptisms done by Protestants are just as valid as baptisms done by Catholics so long as they believe in the Trinity and it is done in a Trinitarian formula.
A person should at least express belief in the contents of the Apostles Creed before being baptized:
I believe in God, the Father Almighty, Creator of heaven and earth; and in Jesus Christ, His only Son, our Lord: Who was conceived by the Holy Spirit, born of the Virgin Mary; suffered under Pontius Pilate, was crucified, died and was buried. He descended into hell; the third day He rose again from the dead; He ascended into heaven, is seated at the right hand of God the Father Almighty; from thence He shall come to judge the living and the dead. I believe in the Holy Spirit, the Holy Catholic Church, the communion of Saints, the forgiveness of sins, the resurrection of the body, and life everlasting. Amen.