Yes, Paul, that is the exact same way that I was convinced too! Yes, I used the baptism to confirm the information. I had always had James Robertson, listed under Edward Robertson/Christina Groat, until I found his death information. It was then that I figured out James was from Edward and Margaret. I have so many Sutherland's in my line too! My grandfather's middle name was Sutherland!
So, it does look like we descend from the same line. From James Robertson/Elizabeth Cromarty, whom do you descend from? Or are you from one of his half siblings (from father's 2nd marriage?)
Jenn