A poorly written piece with many factual inaccuracies. Let's...

A poorly written piece with many factual inaccuracies. Let's examine some of the claims.

1. "Japan is the only country that does not grant citizenship to Muslims. "
False

2. "What's more, the status of ‘permanent resident’ is also denied them. "
False

3. "And the spreading of or teaching of Islam is strictly forbidden. "
False

4. "Muslims can get temporary residence status under two strict conditions, namely, they must speak Japanese and their religious practices will be confined to their homes only. "
False

5. "They cannot found any organizations, cannot build or operate any Mosques and no gatherings for religious purposes are permitted."
False

6. "There isn’t a single Japanese university that teaches Arabic or any other Muslim dialect..."
False

7. "...and not one Koran is to be found, whether an original or translated."
False

8. "Tokyo is the only capital city in the world which has practically no Muslim embassies."
False

Source: http://www.snopes.com/muslims-in-japan/

Other websites also disprove these various clams.