The idea that religion provides some sort of certainty is a complete falsehood trivially debunked by a cursory glance of theological discourse. It provides certainty only to those ignorant of it, just as those ignorant of secular philosophy who never deliberate any of these questions have quite likely settled on some ad-hoc worldview that works for them.
In practice, most of value theory is secular. The laws that underpin most contemporary states are secular. The meaning of life is an unanswered question, quite likely even an ironically meaningless question itself. The afterlife if any is also an unanswered question. Christians disagree between universalism, annihilationism, eternal torment and other dogmas on hell alone.
There are no out-of-the-box answers provided by anyone. Many religions actually conveniently avoid pondering them in any detail.