If you’re up for blasphemy, then God must testify
The chances of the Government actually delivering on this sort of thing, after due constitutional and legal deliberation, are about as likely as the means testing of child benefit or the elimination of TDs’ long service payments. Nonetheless, should it come to pass and one of your readers finds themselves in the dock, consider the following.
1. You can only blaspheme against God, not his adherents, church or earthly representatives. As you have the right to face your accuser, you can request that the court subpoena God to your trial. When he (presumably) fails to appear, the court will be forced to hold him in contempt (is that not a blasphemy too?).