Water baptism is supposed to be an outward symbol of an inward change and a demonstration of your decision to follow Jesus. It is supposed to symbolize a burial of the old man under the water and the rising up of the new man in Christ. In other for this to be any relevant, you must make a conscious decision to do it. If you can't remember it means you did not make a conscious decision and without you actually making a decision it is pointless. Regardless of what churches say the bible is above. If you made the decision to follow God, demonstrate it by being baptized. This is what Jesus and his followers demonstrated.