AXIOS (Russell Contreras) - Campaigns pay the price for America's secular shift
America's fastest-growing religious group is also one of the hardest — and costliest — to reach: the "nones." Why it matters: Religiously unaffiliated Americans now make up a large and growing share of the electorate. But without church-based networks, they're significantly more expensive for campaigns to reach and mobilize. - "Nones" are geographically and socially dispersed. - Campaigns must rely on costly digital ads, canvassing and persuasion to reach them. By the numbers: A record 29% of Americans now identify as religiously unaffiliated — the largest single religious cohort, surpassing Catholics (19%) and evangelical Protestants (23%), per Pew Research Center . - Among Gen Z , it's even higher: Roughly 4 in 10 adults ages…