Most are, yes. Because baptism is a symbol or commemoration of the death, burial and resurrection of Christ it is performed only bu Christ based religions. Denomination does not (or should not) matter as long as its done in full understanding and consent of the person being baptised. It would be sort of pointless to be baptised by a nin-Christ based religion since it would have no real meaning. We get baptised in obedience to Christ/God so getting 'baptised' in the name of Zeus or Freya or Buddah wouldnt really be obedience to God, would it? Quite the opposite, really. It would be a mockery of a sacrement of God, meant to honor His son.
Baptism is just a symbolic action that is to be representative of dying and being reborn a new creation. The "old" man is washed away and the "new" man is raised. It does not give you a free pass to Heaven. That comes from making Jesus Christ your Lord and Savior and following Him in your best ability. In some churches it is their requirement to be baptized in their church to signify "membership". God bless!!
Only Christian baptism removes original sin from our souls, which we inherit from our first parents, Adam & Eve, restoring us to God's friendship. Roman Catholic Christian baptism is best, because the Catholic Church is the only true Church, founded by Jesus Christ, and only it has the full means of salvation, making it much easier her members to gain Heaven. I hope this fully answers your question. If not, please leave a comment. Frank
I was baptized as a baby, that obviously has little meaning to me since I didn't choose it, and don't remember it. I attended several churches for years before I found the religion that, through prayer, I came to know was true. I was then baptized a member of the Church of Jesus Christ of Latter Day Saints.