According to most poll, nonreligious people are more likely to be left-wing voters.
Left-wing voters value more flexibility and freedom of identity.
Left-wing politics supports social equality and egalitarianism, often in opposition to social hierarchy.
In the US, surveys show that Americans without a religious affiliation (including 'nothing particular', agnostic, and atheist) range around 23.8%[3], 22.8%[2], 24.8%[4], 31%[5], 36%[6] and 21%[7][8] of the population.