
You can still be an Atheist and Heathen Snippety...there are plenty about who consider the social values, the things such as fate and ancestors, the land and wights to be more important than deities. After all, and what people often forget about Heathenry when they get carried away with subconciously Christianizing Heathen Gods, is that Heathenry is better expressed as a worldview rather than a religion. Not all people from 'Heathen' times believed in the Gods however they still had what was considered a Heathen worldview.
I know you feel like you are losing something when it comes to the Heathen stuff but try not to see it like that. See this crisis as a blessing, a time to question and go along with it. What would Odin do at a time like this? He'd go with the knowledge and see where it took him. Learn, grow and if you come out of this as an atheist or with your faith renewed then try to accept it. Things happen for a reason. It will have been your luck for that to happen.
It's not an all or nothing thing, we are all individuals and our paths do not need uniformity. There is no uniformity of belief in pre-Christian Northern Europe and this idea of a collective belief as Heathens, the Nine noble virtues, things like the hammer rite do owe more to Christian ideas about religion than actual Heathen Worldview.
In my opinion, the 'keystones' of being a Heathen are:
* A belief in luck/hamingja.
In the sagas, luck can be both personal and shared with family/communities you belong to. Our actions can either cause a loss of luck or a gain of luck and in turn effect those you are connected to. A Heathen recognises and understands this and takes responsibility for his/her actions.
*Respect for your family and community.
By this, I mean not doing anything to adversely effect the shared luck of your group and communities and by extension the personal luck of the people involved with you. A Heathen would work for the benefit of those people.
*Respect and create good relationships with the local land wights.
Lack of respect for the land wights brings loss of luck and affects your community. During the Viking age and before, it was believed that angering the wights could have dire consequences and folks have been known in the lore to have been chased off their land by angry wights. As an interesting side note, the practice of Niding(a form of cursing) grew up around this belief. A horse's head and hide would be mounted on a pole and turned to face the home of person that the would-be curser wanted to curse. On the pole, grave insults would be carved. The Nidstang (the pole with the head on it) was believed to incite the contempt and hatred of the land wights and so it was believed that the wights would go after whoever was made a Niding.
* Honour your ancestors
Ancestor honour and worship is one of the oldest forms of pre-Christian belief.
I hope that helps.