Only when referring to the religious sacrament or rite: "Sacrament of Holy Baptism". In referring to the event (e.g. "my child's baptism), it is not.
Yes, the word "Christening" should be capitalized when referring to the Christian sacrament of baptism.
Yes, "Baptism" should be capitalized when referring to the religious sacrament.
Never. You do not capitalize baptism. The other sacraments are not capitalized with the exception of the word Eucharist; but its adjective form, eucharistic, is not capitalized.
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.
No, the word "epitaph" should not be capitalized unless it is at the beginning of a sentence or part of a title.
The word "banker" 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.