No, he chose it. He converted to Islam.

Islam is more than a religion, or a philosophy, it's a political and legal system rolled into one. 

When one selects it, there are lots of different paths that can be followed, as evidenced by the multitude of factions within the Islamic global community:

 One can be the person who prays five times a day, doesn't order a BLT, and who fasts during daylight in Ramadan. No one cares about these people, they're just people. Some are fine, some are jerks. Such is life.

One can also be the kind of adherent that thinks the really terrible parts of the Quran is hot stuff. I have a problem with those people.

In Britain you can find multiple cultures and societies, including heavily Islamic areas where Sharia courts hold more power than Britain would like. To say that he was born in Britain, ergo he could not have had any exposure to such a society is not factual.