IMO through study, I believe that God has given us doctors, and has given the doctors the ability to learn and study to help with maladies such as depression. While a strong faith can be an asset in getting through life, per se, sometimes we are asked to have faith in the ppl God puts into our lives to help us (i.e. doctors) rather than rely upon ourselves and our relationship directly with Him.

Depression is a medical illness. Do you have the same beliefs regarding taking medicine for a headache, or diabetes?

We are an imperfect human being. God created us perfect, but you know the story..things went differently due to man's free will. What we have is imperfect bodies that become sick, unbalanced and difficult. Allowing God to use others and medicines to help us is a good thing, imo. TC!