Fire, Hell's mouth open, devils lurking and the hand
Don't capitalize it here unless you capitalize it every time you use the word. Just be consistent. You can either capitalize or not, I think.
Capitalize "Bible."
Due to this fact, I believe he is using every available writing device to call attention to this matter (following Christ or going to hell), probably because he saw alarming situations in his congregation.----Every available writing device? If you are studying writing devices in class, name some that he uses. I think the teacher will take away points if you say "every available device."
I think I know what you mean, though. He is so serious about it that he will use shock and fear-mongering to compel people...
This is good writing, but I think you should use this trick: Condense the whole essay into a single sentence and put that sentence at the end of the first paragraph. That is your thesis statement. It will stick in the reader's mind and make the essay clearer and more convincing.
This is not a good sentence to leave at the end of the first paragraph: After he explains this citation he starts enumerating the situations to which the sinners are exposed to and what "sliding" can mean.(Add a sentence here at the end... your thesis statement.)
:-)