God doesn't send you to hell for blasphemy, you auto-send yourself to hell by refusing God's grace.
That's the theology of christianity.
Blasphemy isn't a -50 social credit score on your CCP profile, it's just the fruit of what one harbors in his heart, i.e. you wouldn't blaspheme against God if you didn't reject his grace.
And if you blaspheme against God while trying to reach closer to him, it means that your sinful nature won over for an instant, and all you have to do is reject this sinful nature once more through repentence.
Why is blasphemy suddenly such a big deal ?
Sorry for my sophisticated ESL writing. I should read myself over again more often before hitting the post button.