Yes, the majority of people in Spanish speaking countries are Catholics.
"Spanish" in this sense is a nationality, which would be people from Spain. People form Nicaragua are Spanish speaking, and can be classified as "latino". They are not "Spanish."
catholic
Most Spanish-speaking people live in the Western Hemisphere. The majority of Spanish-speaking countries are located in Central and South America, with Spain being located in Europe.
New Mexico
Mexico was colonized by the Spanish who brought the language and religion with them.
Roman Catholic
the Spanish are pious catholics and when they conquered mexico they taught the indians catholicisim
The nationality of the majority of the people in Paris, France, is French.
"Spanish" is not a religion but the majority of Spanish-speaking people are Christian, predominantly Roman Catholic, the number of which would be in the millions (there are 2.5 billion Christians).
People from Spanish-speaking countries are often referred to as "hispanohablantes" or "hablantes de español" in Spanish.
spanish