There are no contradictions in the Bible. Zero, zilch, nada. There are misinterpretations and faulty applications done by those of us who read the Bible. That is obvious in these forums. One cannot take these three instances and cite them as THE final authority on salvation by grace through faith. Each of us, unless excluded as not having reached the age of accountability before death, must accept Jesus as personal Lord and Savior. I cannot go into anyone's home, lead someone there, including the "head of the household," to saving faith, and then announce that everyone in the home is saved. A personal confession of faith is required, except for those under the age of accountability. Acts 16:31, when Spiritually interpreted and applied, does not contradict any other verse, passage, scripture, or book of the Bible. No other book, scripture, passage, or verse contradicts Acts 16:31.