If I was never married to the parent of my child, will the court still decide the issue of custody?

Yes. Michigan has a Child Custody Act that contains a list of best interest factors. This is used to decide custody where people have never been married to one another. If people have been married, then there is a divorce statute that includes provisions for property distribution and alimony. Interestingly, the divorce statute refers people back to the Child Custody Act for the list of best interest factors, so the issues are the same in custody matters whether the parents were ever married or not.