Can a Catholic be a godparent to a Baptist baby?

Answer 1

No. Canon Law states that a non-Catholic may stand up at the baptism like a godparent would as a witness to the baptism, but only if the other godparent is a Catholic. The other requirements for godparents are:

• having the intention of adequately fulfilling the role as godparent.
• the godparent must be at least 16 years old, unless otherwise specified by the diocesan bishop or unless the parish priest "considers that there is a just reason for an exception to be made."
• be a Catholic who has received the sacraments of Confirmation and Holy Eucharist.
• may not be the mother or father of the person being baptized.
• "not labour under a canonical penalty, whether imposed or declared."

Canon Law also gives a list of stipulations which would disqualify a person from being a godparent:

• if the person does not intend on fulfilling their role and duties as godparent.
• if the person is younger than age 16 (or younger than the age the diocesan bishop has stated).
• if the person is not Catholic.
• if the person has not received the sacraments of Baptism, Confirmation, and Holy Eucharist in the Catholic faith.
• if the person does not live according to Catholic teachings (ex. uses Birth Control, doesn't go to Mass, is pro-choice, etc).
• if the person is a nun, priest, or other religious (because it would not allow them to fulfill the commitment as godparent adequately).
• if the person is the husband/wife of the person getting Baptized.
• if the person is the parent of the person getting Baptized.
• if "the person has incurred an official excommunication or 'latae sententiae,' by the very commission of the offense. (ex. involved in one or more abortions.)"
• if the person is a member of a society condemned by the Church (ex. Free Masons)
• if "the person is a public sinner. (ex. prostitution, living common-law.)"
• if "the person is a heretic."
• if "the person belongs to a schism. 'Schism is the refusal of submission to the Roman Pontiff or of communion with the members of the Church subject to him.' (C.C.C. # 2089)"
• if the person doesn't belong to a specific parish, not belonging to any specific faith.
• if "the person is involved in a mix-marriage and believes his/her children should choose their own religion when they grow up."
• if "the person believes that all religions are equal or that other religions are equal to the Catholic Church."
• if "the person is involved in an invalid marriage. (Example: Justice of the Peace, marriage outside the Church.)"

Answer 2

yes it doesn't depend on their religion

Roman Catholic AnswerOf course of a Catholic can be a godparent to a baptist baby, as long as it is being baptized in the Catholic Church by a Catholic priest!

Answer 3

It would depend on the church and how much role that church allows the parent in selecting godparents.