I should to write a coursework and I think I can't do it all by myself. Is it legal to use an an essay writing websites? Has anyone used an essay writing company? What was your experience?

That is considered cheating and cheating is not acceptable to God. You should get your grades by your own merits not by someone else doing it for you.

I agree doing that is immoral and a sin. You will get nowhere by cheating because when you go to work you will not know what to do. When you get good grades by your own merit it is very satisfying, plus it gives us confidence in ourselves.
Lord teach this person to be an honest person and stop being lazy and study to be an astute person. I pray in Jesus name amen.

Lord convict this person as you teach them to do their work and to studies on their own without having someone else do it for them. Teach them that learning good morals in life is a guarantee for success in the future, unlike cheating which is a guarantee for failure in the future, no matter if you come from a wealthy or poor family the results will be the same. In Jesus name I pray, amen.