I think that you have put yourself to be put in a precarious position.
Where has he ever compromised for you? He wants you to wear a Hijab but he has given you zero legal ( recognition in a UK court) financial security.
For me the glaring thing is that he did not marry you in UK law- that says something don’t you think?
He has had children with you but given you no financial protection.If he truly and deeply loved you, he should have protected you and had a civil ceremony as well recognised under the Marriage Act. That should have been his contribution to this.
This is a man that has had his cake and eaten it. Personally, I don’t see this as love. Legally you have a non marriage.
For all intents and purposes he has given you no security and no protection in UK law. There is no reason why you could not have trotted to the registry office before your Islamic ceremomy and had a simple cheap service to give you financial protection before having kids. Why did you not insist on that?
Things will only get worse as you get older.
Do you both own the home or are you in a rented property? Is he the sole home owner? Do you work? If he was to die what happens then? Would you get booted out of your home by relatives?
I would take the hit now. I would get up and leave him. I would seek legal advice re maintenance under the Children’s Act ( the courts can insist he provides a home for your kids if he has assets).
Religion is not something you should fake. It’s hard enough with any form of belief yet alone going along with it. I was once dating a deeply Catholic man and despite being Catholic myself I could never live the way he wanted. He prayed several times a day. For me this was not a relationship that could thrive.