No need to be puzzled. You're not just telling them what you believe. You're telling them what to believe. There is no other way that we have a billion Muslims who are scared of apostasy and a billion Christians who believe that they are condemned by original sin unless they join the club or of possible hellfire if they break the rules. Tell children the real truth, that, in spite of your beliefs, that there is almost certainly no God, that no miracle has ever been verified, that much of the Bible is of dubious authorship and is not inspired by God, that St Bernadette, etc. were manipulated myth-tellers, and all the rest of the tawdry nonsense that you hold sacred, and we would have a far more honest world. What are you so afraid of?