Religions are proper nouns in any language, and they therefore begin with capital letters.
no
No, "grandmother" (abuela) is not capitalized in Spanish unless it is the first word in a sentence or part of a title.
In general, the word "Spanish" should be capitalized when it refers to the specific language or nationality. However, "homework" should not be capitalized unless it is at the beginning of a sentence. So, "Spanish homework" should only be capitalized if it is the title of an assignment or if it is at the beginning of a sentence.
No, nationalities, religions, days of the week, or months are not capitalized in French.
Agosto (not capitalized).
"In Spanish the days of the week and months of the year are written in lower case unless they are the first word in a sentence." Source: http://www.usa.gov/webcontent/spanish_guide/capitalization.shtml
Sunday is "domingo" in Spanish. Note the days of the week are not capitalized in Spanish.
"Thursday" in Spanish is "jueves". It is not capitalized.
You would say "español". It is not normally capitalized.
The Spanish word for "June" is "junio". It is not capitalized.
"Monday" in Spanish is "el lunes", and is not capitalized.
Spanish should be capitalized but olives shouldn't be.