Conversion to Christianity

===Denominational switching===
Switching from one Christian denomination, such as Presbyterianism, to another Christian denomination, such as Catholicism, has not generally been seen by researchers as conversion to Christianity. Mark C. Suchman says this is because most sociologists and other scientists have defined conversion as "radical personal change, particularly change involving a shift in one's sense of 'root reality'."{{sfn|Suchman|1992|p=S15}} However, in Suchman's view, this produces a form of 'selection bias' within the research.{{sfn|Suchman|1992|p=S16}} He writes that the study of "everyday" religious mobility is not a substitute for analyses of "true conversion," but the denominational switching that he refers to as "religious mobility" can be seen as an aspect of conversion.{{sfn|Suchman|1992|pp=S16-S17}}

Suchman describes six types, or causes, of "religious mobility" as a supplement and complement to the more traditionally limited concept of conversion.{{sfn|Suchman|1992|pp=S17-S18}} He draws on theories from the sociology of deviance where there is some recognition that "a change of religious affiliation generally represents a break with previous norms and a severing of social commitments - even when it does not involve a radical personality realignment".{{sfn|Suchman|1992|p=S18}}

Theories of deviance define what can be considered as the variables and determinants involved and what kind of mobility can be seen as random.{{sfn|Suchman|1992|pp=S18-S19}} "Strain theory" argues that those who are unhappy in their religious affiliation will generally "engage in deviance" from that group.{{sfn|Suchman|1992|pp=S19-S20}} Those who are not well integrated in their religious social group, those who become enmeshed in social relations outside the group with participants in deviant cultures, and those whose ethnicity and traditional background differs from their current affiliation are candidates for switching.{{sfn|Suchman|1992|pp=S20-S21}} Intermarriage, with partners of different religions and/or denominations, is also associated with religious switching.{{sfn|Suchman|1992|p=S21}}