Tip on counter service, don’t tip on retail purchases. This was a retail purchase. If you had gotten a latte you should’ve tipped a dollar for that, but not on the entire total.
You’re probably not going to hell because hell probably doesn’t exist. However, whether you are cast into the outer darkness, where there is weeping and gnashing of teeth, that’s another matter and I suggest truly repenting for your misdeeds… of which this was not one, to be clear.