Abram's question is not faithless — it echoes the prayers of faithful people throughout Scripture who ask for signs (Gideon, Mary). God does not rebuke Abram for asking; instead He answers with the extraordinary covenant ceremony of the following verses. Asking for confirmation is part of honest relationship with God.
Memory phrase: It is okay to ask God for confirmation.
Talk about it: Abram believed God but still asked 'how can I know for sure?' Is that the same as not believing? What do you think?
Prayer: God, I believe You — and sometimes I also need something to hold on to. Thank You for being patient with my honest questions.