Mercifully, Republicans still have the edge with the white Millennial vote so there's hope yet for a few of them.
Unfortunately whites are a diminishing part of that demographic, and even many of them don’t see communism as an assault on private property - they have little, and don’t expect to get very much (ever). Religious opposition to communism probably doesn’t even exist with millennials, as religion itself doesn’t.
Communism is thwarted when productive people see it as theft of their wages/property; don’t expect much opposition from a group with little of either. Until their economic prospects aren’t so dim, understand why they think capitalism fails.