How do we get the idea that the "sons of God" are fallen angels?
The term, elder, has a wider range than the term, bishop. Elder may refer to Old or New Testament offices. It may also refer to men of age, experience, and/or wisdom. Bishop refers to a specific New Testament office.
When non-christians ask us how we know that what we believe in is the truth, and how do we prove it, how do we answer that question?
Since God said we should not kill, is it not a sin when born again Christians in Military services do so?
In Matthew 2:23 it says "And he came and dwelt in a city called Nazareth: that it might be fulfilled which was spoken by the prophets, He shall be called a Nazarene."
