I think the OP is looking at funerals wrong.
Funerals aren't about the dead getting to heaven, though some parts of a religious service may reference that. They are about family and friends coming together and dealing with the loss, bonding, and coming to grips with their own mortality.
If you don't believe your grandfather is going to heaven, that doesn't mean you have to boycott a service. As long as they don't make you pray or take communion, why can't you be there?
In this life, it is easy to be against things, but that shouldn't define who you are. To me, the fact that there is no afterlife means that is is important to be a witness to loss and suffering. There is no god to make things better - there is just us.
Funerals aren't about the dead getting to heaven, though some parts of a religious service may reference that. They are about family and friends coming together and dealing with the loss, bonding, and coming to grips with their own mortality.
If you don't believe your grandfather is going to heaven, that doesn't mean you have to boycott a service. As long as they don't make you pray or take communion, why can't you be there?
In this life, it is easy to be against things, but that shouldn't define who you are. To me, the fact that there is no afterlife means that is is important to be a witness to loss and suffering. There is no god to make things better - there is just us.