You’d prefer to take the chance of badly offending a grieving family at a funeral and disrespect the religious beliefs of the deceased rather than find an unobtrusive way to honour your own faith? :ehh:
For Asatru, the problem with doing this is that you would (a) be invoking the Christian god into a space in which he is not welcome and we believe that this has consequences for everyone involved whether you choose to believe it or not. (b) Under our traditions, you would be casting dispersions on the honour of the dead Asatruar and we don’t tend to tolerate that kind of thing well. You don’t have to hide that you’re a Christian, but you should be respectful in a religious space that is not your own. I would not go to a Christian funeral and raise a horn in honour of the deceased, I would do that on my own time elsewhere.