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Not as much as people tend to think. Here is some info for Central America -- bearing in mind the raw numbers don't account for the large degree of superstition, synctretism, lack of practice, etc.

Mexico: 80% Catholic (just 43% of which identify as practicing)

10% Protestant

~10% Agnostic/Atheist

http://www3.inegi.org.mx/sistemas/TabuladosBasicos/Default.aspx?c=27302&s=est

Belize: 40% Catholic

32% Protestant

10% Other

15.5% Atheist

http://www.belize.com/belize-demographics -- The official state census site is down ATM.

Costa Rica: 70.5% Catholic

14% Protestant

11% Atheist

2% Buddhist (?) http://www.state.gov/j/drl/rls/irf/2008/108520.htm

El Salvador: 47% Catholic

33% Protestant

17$ Atheist

3% other

http://www.state.gov/j/drl/rls/irf/religiousfreedom/index.htm#wrapper

Guatemala: 50-60% Catholic

30-40% Protestant

5% Syriac

3% Orthodox

http://www.state.gov/j/drl/rls/irf/2006/71462.htm

Honduras: 47% Catholic 17% Other

Annuario Pontificio, 2009.

Nicaragua: No recent information.

Panama: 75-85% Catholic

15-25% Protestant

http://www.state.gov/j/drl/rls/irf/2007/90262.htm