I don’t agree and I think this kind of overreaction isn’t helpful at this stage. This seems to ignore what the OP actually said about the cause…
The OP tells us that there is a clear source of the parasite, it’s not Belial but Belial isn’t helping. This is usually because either he’s not in contact, or he thinks the OP can handle it.
A basic-bitch parasite is not a hard thing to get rid of. Just because Christians call literally everything not an Angel or a Saint a “zomg demon!” doesn’t mean they are anything of the sort. A simple cleansing is easy to do and if it doesn’t work then you escalate. But there’s no need to go cracking nuts with sledgehammers. Also Belial is not a being related to the Jewish archangel, they have no authority over him… the OP does though.
This is mage-work 101, every mage needs to be proficient with keeping good spiritual hygiene to avoid this, and few bother, preferring to skip to the sexy parts. But it’s better to be safe not sorry and pay attention to the boring shielding and warding bits first.
If it’s Belial, you don’t just tell him off, you put your foot down and demand he fucks off in no uncertain terms, you banish to throw him out the door and firmly tell him to stay away. You MUST stand in your power as powerful mage and demand to be taken seriously. This is an important lesson that is a crisis point for you to carry on your path.
In my experience, and from what I’ve noticed on the forum is that Belial is a prime target for imposters. He can be stern, and frequently gets blamed for “testing” but honestly there’s zero reason to respond to being “tested” and he respects you if you refuse that shit. But it’s usually an impostor feeding on you that does that.
So that’s a parasite - this is what they do it’s a hallmark of the things. Belial honors free will as ime and would stay away. That’s good because those are not really tricky to get rid of, but you don’t do it by asking or doing subliminals - you ATTACK Them with fire and try to kill them. That’s it, it works and it also keeps others away.
This is why I linked magickal techniques that work, subliminals are not suited for this, they’re wishful thinking at this point you are in a fight and you have to put your fists up and fight, not play music for the stupid thing.
Use your own authority and strength for this, it’s far more effective, because you have the high ground. There some sort of law that makes it so that self defense opens up a lot of power.
This is my go-to method for killing parasites. You can also use it on any being claiming to be whatever. If it’s Belial it’s what he wants - for you to stand up for yourself and he wouldn’t mess with you if he thought you couldn’t take it. This may be the point, a learning experience so that next time you have parasite removal in your toolbox.
His reputation is mixed, most mages around these parts work with Belial just great, including me. Again I have seen that most people blaming Belial or any other higher being for a bad experience did not take steps to avoid parasites and/or imposters.
On the other hand, Belial is permanently invoked for me and has protected my a few times from spiritual attacks he knew I would be too damaged by, and he stands back if he knows I can handle it. He’s the last line in my bastion of spiritual defense, and or this reason my feeling is if he’s around, he thinks you can do it.