How can humans become Angels if (Ecclesiastes 12:7) says "and dust returns to the ground it came from, and the Spirit returns to God who gave it" and (Ecclesiastes 3:20) "All go to the same place; all come from dust, and to dust all return."
People don't become angels. No one* ever said they did.
The most well known angel species (Cherubim and Seraphim) are different species than homo sapiens
The source of the myth that people become angels is based on a misinterpretation that just isn't held.
*By "no one" of course I mean no one in a position to speak intelligently as to the scripture or traditions of the church. This is a folk belief, not a doctrine of any recognized denomination.