1。基督徒的范围多广？天主教内的弟兄姐妹算基督徒吗？为什么？

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。为什么现在的神迹比过去的时代少？是由于信心的原故吗？

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.