According to some comments & answers to What are the after-effects of insulting gods/goddesses? it appears that in the grand scheme of things, the Karma theory is going take care of all those who speak ill of gods.
But my question is, does Hindu scripture contain any blasphemy laws? Does it recommend any punishments (daṇḍa) for these people?
E.g., Manu recommends these punishments for members of one varṇa insulting the other:
śataṃ brāhmaṇamākruśya kṣatriyo daṇḍamarhati |
vaiśyo'pyardhaśataṃ dve vā śūdrastu vadhamarhati || 267 ||
On abusing a Brāhmaṇa the Kṣatriya should be fined one hundred; and the Vaiśya one hundred and fifty; or two hundred; the Śūdra however deserves immolation. — (267)
. . .
dharmopadeśaṃ darpeṇa viprāṇāmasya kurvataḥ |
taptamāsecayet tailaṃ vaktre śrotre ca pārthivaḥ || 272 ||
If through arrogance, he [once-born] teaches brāhmaṇas their duty, the king shall pour heated oil into his mouth and ears. — (272)