At the time of writing there is only one (semi) professional footballer in England. Liam Davis. He plays in the conference league, in the 6th tier of the football pyramid.
In Earlier this year he spoke to a Rugby player about the barriers more high profile gay footballers may face to prevent them coming out publically.
Although Liam mentions incidents of homophobia from some opposition players, in other interviews he has stressed how supportive his current and previous team have been.