Angola reportedly bans Islam. How can they do that though?

Angola reportedly bans Islam. How
can they do that though?
Shouldn't there be freedom of religion to every
citizen of a country, so how can Angola do this? If
reports are to be believed then the Southern
African country has become the first country in the
world to ban the Islamic religion. According to
multiple reports coming from Angola, Mosques in
the country have been closed down and some
even destroyed.
The Guardian reports that on November 22, the
Angolan Minister of Culture Rosa Cruz e Silva said
that “the process of legalization of Islam has not
been approved by the Ministry of Justice and
Human Rights and so their mosques would be
closed until further notice.”
Does a religion need to be legalized? The minister
also said that the closing of mosques was done in
a move to stop so-called 'illegal religious sects.'
Under new laws in Angola, many religious sects
have suddenly become criminal.
Yesterday November 24, Angola President José
Eduardo dos Santos said that the country is
working toward putting an end to Islamic influence
in Angola once and for all while the Governor of
Luanda, Bento Bento, said that “radical” Muslims
are not welcome in the country and that the
Angolan government will not be legalizing
mosques or other places of worship for Muslims.