SOLUTION
Part 1
Even though a strong linear relationship exists between the number of churches and the number of homicides it does not suggest that building new churches increases the number of homicides.
Part 2
A strong positive linear correlation coefficient was obtained due to the presence of a lurking variable that is, a variable that is not included as an explanatory or response variable in the analysis but can affect the interpretation of relationships between variables.
A lurking variable can falsely identify a strong relationship between variables or it can hide the true relationship. For example, a research scientist studies the effect of diet and exercise on a person's blood pressure. Lurking variables that also affect blood pressure are whether a person smokes and stress levels.
In the case of the question, the lurking variable could be an increase in population in the cities. It could affect your interpretation of the relationship between the explanatory and response variables.