Costa Rica official religion is Catholicism. There are Catholic churches in nearly every town, big or small, throughout Costa Rica. Most face west, a handy thing to know, and most have a football (soccer) field in front. They represent a strong cultural a social connection to the community.
About 69% of Ticos are Catholic with 20% various evangelicals and the rest are heathens. There is also Mormon Temple and Jehovah's Witnesses and others have a strong presence in CR.
If you attend Catholic services almost anywhere in the country, mass will be said in Spanish with a couple of exceptions.
Because there are so many English speaking visitors and residents, The Anglophone community here has its own English-language churches, in addition to some in Limon which basically serve the descendants of the Jamaican immigrants of a century ago.
Now if you are a Christian and would like to attend English-language service, the International Baptism Church has services every Sunday.