If God does not allow sin to enter into Heaven then why is Satan allowed access to accuse the brethren?

I understand at one time Satan was an angel in Heaven, the most beautiful. I have often wondered where his sin derived from to want to "take over". As I understand it, he was the one to start "tempting" to cause Eve to sin, but what caused his sin to become what it led to?

What facts do we know about the fall of Satan? Did he cause other angels to rebel with him? Were the angels deceived or did they know what they were doing?

Can you explain the woman being hid in Revelation 12 and Israel's part in the tribulation?

How fast is to and fro? Is it instantaneous or is it hours long when the devil went to and fro upon the earth in Job chapter one? Was it in seconds or did it take all day?

The devil was certainly created before the creation of the world since the Bible says the devil was

Is it wrong to preach an outline that you got off of the internet?

We have been going over the qualifications of a bishop and I was wondering if a divorced man can Pastor or not?

I am a preacher, an assistant pastor of a church. I was wondering if you knew of anywhere I could find some courses for expository preaching? My main focus is to be able to preach God's word in its fullness and not in my opinion. If you could help me find anything on this I would appreciate it.

I am a Southern Baptist. My daughter, who is 11, has a best friend who my daughter sometimes attends church with. Her friend is of the Lutheran faith. Can you please explain to me the differences between the two doctrines?