Baptism is necessary because:
Yes, you need to be baptized and Catholic to receive communion. If you are not baptized and are under age 8 you can be baptized with the permission of parent. If you are not baptized and are under 18 you will need to show an understanding of the sacrament before being baptized. If you are not baptized and are an adult you will need to attend classes and then be baptized and confirmed and receive communion at an Easter Vigil Mass.
You don't you have to be baptized to have a sweet 16.
No. A person can only baptized once. If there is a question if a person was baptized properly, they can be baptized conditionally.
That is a personal choice you should discuss with your church. They are not the same thing.
If you wish to be a Catholic, yes you will need to be baptized, unless you have received a valid baptism elsewhere.
No, you do not need to be baptized again after backsliding. Baptism is a one-time sacrament that signifies your commitment to your faith, and it does not need to be repeated. Instead, focus on repentance and recommitting yourself to your faith.
This depends on the rules of the Church into which you switch. If a person is baptized in a Protestant Christian church, and switches to the Catholic Church, he does not have to be baptized again.
No. As Christians, we believe in 'one baptism for the remission of sins.' You cannot be baptized twice. As long as you were baptized using the formula: "....I baptize you in the name of the Father, and of the Son, and of the Holy Spirit," then your baptism was perfectly valid and it does not need to be repeated.
Roman Catholic AnswerYou need the pastor of your home parish to approve you to have your baby baptized. He can make arrangements if you wish to have your baby baptized in another church.
He wanted to set an example for us to do after accepting him into our hearts
John said, "I need to be baptized by you."
Yes, you do. However, if you are baptized in another Christian religion and desire to become Catholic, you will not be baptized again as catholics recognize the one baptism. You will need to take special classes before receiving communion and confirmation.