Obviously, personality as a factor need to be precisely defined and controlled. However, currently we are testing the way of verifying our hypothesis, not the hypothesis itself.
Veryfing if attachment to God is a mediator of tested processes could be also very interesting. Anyway, we are assuming that spirituality is broader term than belief in personal God.
Thank you for your response. I understand the importance of considering the larger construct of spirituality as opposed to religiosity (which I define as spirituality mediated through a set of religious practices and beliefs). That being said, I am still left wondering whether a person's sense of attachment is part of their experience of spiritual comfort, whether it is based in the phenomenological (i.e., practices) or in the noumenal (e.g., belief in a god).