Estonia has a rich and diverse religious history, but in recent years it has become increasingly secular, with either a plurality or a majority of the population declaring themselves nonreligious in recent censuses, followed by those who identify as religiously "undeclared". The largest minority groups are the various Christian denominations, principally Lutheran and Orthodox Christians, with very small numbers of adherents in non-Christian faiths, namely Judaism, Islam and Buddhism. Other polls suggest the country is broadly split between Christians and the non-religious / religiously undeclared.