That's a fun comment, but it is missing the point. It's not God's logic It's the author of Mark's logic (who probably wasn't called Mark, but I'll call him Mark out if convention). The way I read Mark is that he is less concerned with reporting events and more concerned about making theological points, often quite cryptic points. So the fact that this is at the start of Jesus's ministry, the fact that it is near the start of the gospel, the fact that it is not just recounted but beefed up with heavens opening, the Holy Ghost descending and God declaring Jesus his son... means that this is theologically very significant to Mark. So I don't see Mark just skipping birth narratives but telling against them.