Even though it says "Repent and be baptised" in Acts 2:38 baptism is not a necessity to be saved and get to heaven. One reason we know that is the thief on the cross who turned to Jesus while dying and said; "Remember me when you come into your kingdom." Jesus did not say "I cannot let you into heaven - you have not been baptised!" No, Jesus said; "Today you will be with me in paradise." (Luke 23:42-43) Baptism for a believer is a matter of obedience and is helpful for them, but it is not a requirement for salvation. See the meaning of baptism.