Interesting question... Wiktionary lists "gospel" as the main spelling, and "Gospel" as alternative spelling.
The general rule is that an noun should be capitalized if it is a proper name; this is a bit doubtful. Are there four gospels, or four versions of the same "gospel", "gospel" meaning something like "message" in this case? In the latter case, "gospel" would be a unique item, and should be treated like a proper name.
Another general rule is that certain items are capitalized if they are considered sacred, so that may be the reason why "Gospel" is capitalized by some.
The word 'will' should be capitalized only when it is a person's name or the first word in a sentence. As a verb or common noun, it should not be capitalized.
Yes, Sunday should always be capitalized.
The second word should not be capitalized
As an abbreviation it should be capitalized.
No, the word "smartphone" should not be capitalized unless it is at the beginning of a sentence.
Gospel should be capitalized when used as a specific reference to any or all of the four Gospels, for example, the four Gospels, the Holy Gospel, the Gospel of Matthew, and in titles of documents. Gospel should be capitalized when beginning a sentence. Gospel should be lowercase when used as a general term meaning "good news" or "story", for example, "the gospel as presented in the New Testament," "Paul took the gospel to the Romans"; of Jesus Christ, when referring to the law and the gospels; when referring to the law and the gospels; when referring to the third reading in the service.
The word "banker" should not be capitalized unless it is at the beginning of a sentence or part of a title.
No, the word "epitaph" should not be capitalized unless it is at the beginning of a sentence or part of a title.
Yes, Greek should be capitalized.
Yes it should be capitalized.
I think so 'cause its a proper noun.
Yes Capitalized