As written above my family is "religious". In the sense that they don't believe in the real God we know.
They are aware that I am not part of it, but they still constantly mention their false god and religion in their daily life.
I told them a million times to be respectful. At least while I'm present not to pressure me into their shit, and think they can only talk about it, while if I start talking about what I want they see it as a threat...
Unfortunately I am still not able to separate myself from them. I'm really waiting for that day.
They even begged me to go to church, even though I attacked them verbally many times on that topic and tried to say it nicely, but it was no use.
Luckily, I'm not forced to go there.
Any advice what else i can do?
Thanks in advance.
HAIL SATAN
As others had said, any communications will be hampered by the difference in spiritual status and affiliations between you and them; their souls are tied into Christianity for the time being and this skews their behaviors.
There are spiritual options available to break them out of this, but as you are new, you will want to spend lots of time on building up yourself. Focus on your own advancement and increasing the Satanic influence in your own soul, which will eventually overpower them.
You are correct that they will see your opposition as a bit of a threat, or maybe they will want to "help you" understand. This is where being too aggressive can actually be the wrong response. Rather, do and say things that "lets out steam" so to speak, without actually having spiritual significance.
Personally, I would pretend to be a "private Christian". What I mean is, tell them you are not very open to mainstream Christianity, but you have private beliefs in their god and you keep this to yourself, pray in your room, etc. Obviously you are just saying this, or when you refer to "God" you can secretly be referring to Satan, and so on. Furthermore, just stay neutral when they talk about Christianity, or feign interest; don't scowl or try to counter them, unless they try to make you go to church or publicly pray.
Cede to them the things which are not actually meaningful as a way to protect that which actually is, which is your spiritual growth and the exercises involved in this, as well as your general safety within the family.
By doing this, this gives the appearance of a middle ground, which is easier for them to accept, and therefore makes them less likely to push on you anything else. They will think "at least he is kind of like me, even if not fully". On your end, you have bought yourself security and privacy, from which you can go full force with meditation and actual spiritual development in your room.
When you have the chance, also remember to spend some time having fun with them and building a relationship outside of controversial topics like religion. This can be something simple like watching a video with them, or something. This keeps the relationship strong and prevents them from potentially alienating you, and/or feeling alienated or distant on your own end. Play off of existing synastry and highlights of your interactions with them.
Furthermore, remember always to keep up a strong AOP and connection with the Gods. If the situation is bad enough, you can raise energy or even a full working to deal with them. For example, Ansuz can be used to free yourself from any obstacles from them which may threaten your spiritual development. Isa can be used to bind them from taking action against you. Berkano can shield and hide yourself and room from them, and so on. There are options here.