Dating a non-Satanist doesn't have to be completely bad or wrong. Obviously you just want to be a little careful about who you choose as a partner.
You're definitely gonna want to take your time building trust between each other before you start meditating around your partner or doing rituals lol.
You definitely want to start with babysteps, like maybe talking about spirituality, philosophy, religion and just overall looking into how open they are about any giving subject. And again, in the mean time, while not meditating or doing rituals around them. If they happen to be open and have a positive way at looking at these things, then you're definitely in the clear.
At that point, you can mention that you're spiritually minded, that you like to meditate or do you do yoga. And by then, you'll be able ease up around you partner. You dont necessarily have to tell them you're a Satanist. A perfectly healthy relationship can still be solidified and something longterm can definitely manifest in a positive way; including kids down the line.
The obvious red flag is if they're a hardcore Christian and totally closed off from understanding a different perspective. At that point, unfortunately it's mostly impossible that they'll accept you in any real way, and the relationship would have to end.
I hope this helps.