Data can be collected by survey. Possible question could be:
To what extent do you agree or disagree with the statement: It is right for my church [or faith group] to speak out against injustice.
For analysis a simpe percentage should be taken of the number of respondents reporting that they agree or strongly agree with the statement. Care should be taken in deciding whether this percentage applies to just those surveyed or whether it can be ascribed to the population as a whole. This will depend on the design of the survey and whether or not it was a representative sample of the population.