More than was made. It’s not realistic to expect religion to be eliminated in less than a century; even with speedy development, the USSR was backward for most of its lifetime.

The “old vices” grew again heavily because exploitation, inequality, and class divisions reappeared, as well as the government allowing religion to gain institutional footholds as it lost its character as a dotp. As for why it ceased to be a dotp, unequal development across various areas as a result of leaps in modes of production/premature centralization caused different classes to assert themselves in the party.