Can you make vegan garlic bread, if so how does the use of margarine effect taste and texture? I enjoy a nice garlic baguette so much, but I have to drink a pre-emptive, schedule 5, painkiller not to die from being so lactose intolerant. I was wondering if a solution can be found that does not include narcotics, maybe substitute the butter for margarine? I know the French would call it barbaric, but can you do it?
Margarine will  not impact the texture, and probably will not alter the end result dramatically.  It, of course, is not butter, so as long as the flavor is fine with you.  But, you also don't need butter or margarine. You can use olive oil.  Sweat garlic in olive oil.  Proceed from that point.