1。基督徒的範圍多廣？天主教內的弟兄姐妹算基督徒嗎？為什麼？

The Christendom includes Roman Catholics, Eastern Orthodoxy, and Protestants, with many denominational divisions. But not every self-professed Christian in the Christendom will be recognized as such by the Lord Jesus, as clearly predicted by him.

2。為什麼現在的神跡比過去的時代少？是由於信心的原故嗎？

The total number of miracles is probably a lot more than 2000 years ago. The per capita miracles may be smaller in areas where people do not believe in miracles. Faith or the lack of it does play a role, as clearly taught by Jesus.