Etiquette: Front or Back?

I know this will come off as a stupid question but it’s actually a pretty good one.  I bet the answer you’ll give me is a well thought of answer, but the actual application?  Haphazardly thought over.  Hahahaha.

The Philippines have so many aisles and pews.  We like lining them up.  So the question is this:

When you pass by a group of people, do you give the front?  Or the back?

Better question, which is more appropriate to give?

That lady there looks grumpy.