Is faith necessary for adults to be baptized?
Adults must have faith for baptism, but it need not be a fully developed faith. TheCatechism explains:
The faith required for baptism is not a perfect and mature faith but a beginning that is called to develop. The catechumen or the godparent is asked: “What do you ask of God’s Church?” The response is: “Faith!” For all the baptized, children or adults, faith must grow after baptism. (CCC 1253–1254)