The statistics appearing on this page were based on data published in the following studies by the Pew Research Center:

Information concerning the total population of the countries surveyed was taken from the CIA World Factbook (here).

Note that the percentages don't total to 100% in most of the graphs because it was possible for someone to say they didn't know, to offer a different answer than those that the surveys were prepared for, or to refuse to answer a question. More information about the sample sizes and the margins of error can be found in the Pew publications themselves, along with information concerning the methodology employed and difficulties encountered. However, for the Pew study that looked at Christians in Latin America, the sample sizes ranged from 1500 to 2000, and had margins of error between ± 2.8 (Nicaragua) and ± 4.0 (Peru and Paraguay). For the U.S. study, the sample sizes ranged from 18,900 for Protestants to 215 for Jehovah's witnesses, and had margins of error between ± 1.5 points for Catholics and Protestant subdivisions to ± 7.5 points for Jehovah's witnesses.

In interpreting the numbers found on this page, be aware that the fact that a belief or value x exists for a given subset of Christians does not by itself show that Christianity is wholly or even partly responsible for that being the case. By themselves, the statistics on this page say what is the case, not why.

Be also aware that someone might respond to a question with a particular answer not because they genuinely believe it, but because they think that is how they should answer it. For example, a Catholic might answer that they believe the bread and wine in communion literally transform into the flesh and blood of Christ not because they actually believe it does, but because they believe they should believe it. Polls like those carried out by Pew find answers to what people believe based upon what people report believing, not what they actually believe, and the two needn't be the same.