He works for a company that sells CDs of Qur’aan and hadeeth, and also CDs of music and movies

If you can make your work dealing only with the CDs of Qur’aan, hadeeth and similar material that is beneficial or permissible, and not deal with anything that is haraam, then there is nothing wrong with you staying with this company. 

But if that is not possible, in that the one who works at this company has to work in all sections and he cannot limit it to some of them, then it is not permissible to work in this company, because that is helping in sin and transgression, and spreading evil and haraam things, and Allah says (interpretation of the meaning):

“Help you one another in Al‑Birr and At‑Taqwa (virtue, righteousness and piety); but do not help one another in sin and transgression”

[al-Maa’idah 5:2].

The scholars of the Standing Committee for Issuing Fatwas said: 

It is not permissible for a Muslim to help anyone in that which involves sin, disobedience and transgressing the sacred limits of Allah. End quote. 

Fataawa al-Lajnah al-Daa’imah, 13/173 

The scholars of the Standing Committee for Issuing Fatwas were asked: 

I own a shop that records cassette tapes and repairs radios and televisions. I rerecord these tapes to sell them, wholesale and retail; these tapes contain both good and bad material, and some of them contain songs and nasheeds, and Qur’aan, and religious lessons. I am a man with dependents and a family, and my eyesight is weak, which makes me rely on earning my living by selling these tapes despite what they contain, more than repairing radios and TVs, because there is not much of this work. I am a religiously committed man and I am worried about the provision of my family. What is the ruling? 

They replied: 

It is not permissible for you to record songs and music and the like, or to buy and sell such things, even if you do not listen to what is recorded on it, because this work of yours is helping those who use them for the purposes of sin and transgression. And Allah says (interpretation of the meaning):

“Help you one another in Al‑Birr and At‑Taqwa (virtue, righteousness and piety); but do not help one another in sin and transgression”

[al-Maa’idah 5:2]. End quote. 

Fataawa al-Lajnah al-Daa’imah, 26/274-275 

The money that you have learned from this work is mixed; some of it is haraam and some of it is halaal, but the portion that is haraam is greater if the haraam activities of the company are greater. 

Our advice to you is to leave this company and to think positively of Allah. Whoever gives up something for the sake of Allah, Allah will compensate him with something better than it, and whoever fears Allah, He will make a way for him to get out (from every difficulty) and He will provide him from (sources) he never could imagine. 

And Allah knows best. 

For more information please see the answer to question no. 98062.