People believe all kinds of things about what happens when we die. One is that people become angels. Another is that we become flowers in God’s garden. But are these things true? Some may genuinely believe these things. Others may just be holding onto a nice idea while dealing with their grief.

Let’s dig into the subject about angels. Do we become angels when we die or not? How do we know? Where would anyone get the idea in the first place?
http://www.118wjj.com/who-becomes-an-angel/

Do We Become Angels When We Die?
No. We do not become angels when we die. Humans are one kind of God’s creation, and angels are another. To say we become angels is to say we stop being humans.

What does the Bible say about mankind and angels?
Creation

Psalm 8:5 says, “You have made them [human beings] a little lower than the angels and crowned them with glory and honor.” (Explanatory emphasis added.)

God separates humans from angels in what they were created to be.

Another verse to look at is 1 Corinthians 6:3. Here Paul is explaining to the people of Corinth how people will judge angels. We cannot do what Paul is saying if we cease to be human and transform into an angel.

Genesis 1:25 reminds us God created everything after its own kind. There are different kinds of angels (Seraphim, Cherubim, Archangels, etc.), but they’re all angels. There are different races of people, but they’re all people.