It appears as though moderate red wine drinking actually protects against AF:
medscape.com/viewarticle/95...
In this UK study of 400,000 adults, consumption of 1 to 7 glasses of red wine a week reduced the incidence of AF by 6%. White wine also had a similar though lower effect and beer and cider increased risk at any level. Interestingly, the risk of AF never increased at any level of red wine drinking compared with non-drinkers.