Unless you have a very specific reason you want to perform a DNA test I don't see why it is useful, the risks seem to great for me. Those companies, even the truly legitimate ones are most likely connected to jews one way or another and there is so much they can do with your DNA that I would not want my DNA to be used for appart from just storing it for easy recognision of who you are...
Since you are here and you have a genuine desire to live as a spiritual satanist I can assure you you aren't jewish, so if you are worried about that in some way and want to test your DNA to make sure you aren't jewish in any way it's not necessary at all.
Just be racially aware and be proud of who you are. If you have mixed genes then there will be a culture or a certain ethnic group you will more natural being with or you feel drawn towards in an inexplicable way that is most likely where your souls racial identity lies.
The more you meditate and advance yourself, the more dross will be cleared out and the closer you will come to your true identity, which includes your souls racial identity aswell.
I suggest you focus more on simply advancing and growing who you are now instead of worrying about your ancestral lineage to much, since this can hold you back and in reality is not the most important thing.
You are who you are and the way I see it, there is no need to know exactly your genes in order to find out who or what you are. Try to focus more on advancing who you are now and focus more on the present instead of holding on to worries about what you are not or wishes about what you could be. Your potentials will develop on their own when you simply advance and you will come to know your self much better than with simple self exploration.
Credit goes to HP Hoodedcobra for this piece of wisdom.