Secularism is neutral. Its application, seen by you as a universal good, is only as good as the nation-state's/regime's intentions. It happens to be an effective way to govern a modern society when used to protect religious minorities. China is among the world's most secular nations. It routinely rounds up people with "undesirable" religious beliefs, closes their places of worship, edits their holy books, and sees their faiths as ideological competitors rather than a protected institution as in the United States.
China also routinely tortures and executes thousands of people. If what you wrote were true, China would be an enlightened beacon of secular human progress. Instead, secularism is used as a weapon to oppress all ideologies other than the state approved propaganda.
"Progressive" nations with lofty secular ideals have their own taboos, just as Muslims in Indonesia do. A lesbian in Norway is facing up to three years in jail not because of her identity as a lesbian, but because she "misgendered" a transgender woman and said he couldn't be a lesbian. She didn't harass him, she didn't cause any injury as best as the average person can see. But, because the transgender woman represents a protected class in modern, progressed, and thoroughly secular Western societies a taboo around this issue has crept into the legal framework.
And this isn't some isolated case. Taboos placing limits on free speech, i.e. Western blasphemy, crop up every bit as much as they do in Indonesia. Look, Indonesia has its opportunities. It ain't perfect, far from it. Even I don't think they should criminalize what is a civil matter. But I also don't think this makes them backwards.