I went to a get together of a friends last week. The majority of people there were, I think methodists . Not a problem. I'm interested in other people's point of view. I was brought up RC. I was informed that I should be baptised and immersed in water to have my name in the book of life . As to be christened was just a warm up. Now, I'm not a great believer anymore, but I'm interested in why the methodists didn't think me being christened was good enough. Yet donating to food bank would get me to heaven on judgement day.
Well, christening babies is quite odd for Christians (I'm from a baby-baptising family). All rituals involving babies are statements of intent about their upbringing, as it would be strange to believe that a ceremony at 4 months determined anything else about the future adult. Adult baptism does make more sense.
It does make more sense to baptise as an adult, until you bring in the Catholic belief that you can't go to heaven until you've been baptised. At that point it suddenly makes a lot more sense to baptise babies asap in case they die before they can make their own choice. Catholics do have an "adult" ceremony, confirmation, which is often performed as teens (so not quite adult but considered old enough to make your own decisions), which serves the same purpose as other denominations baptising adults.