This is the whole problem with the prosperity Gospel-- trying to question a person's faith who does not use it to ask for material wealth. I have more important issues to address with God than the kind of car I drive. This notion contributes to all these people who buy things they can not afford because some preacher tells them they should have faith that God will provide.
What am I willing to ask for-- mercy, forgiveness, peace, joy, friendship, patience, perseverance, love, gentleness, meekness, wisdom, understanding, and courage.
Again, I do not agree, My kid knows better than to ask me to give him certain things. I have raised him not to be materialistic. We have higher priorities. I am far more concerned with peace in my heart than money in my bank account. I believe it cheapens the Grace of God to focus on it as if He were Santa Claus and you are some kid asking Him to bring you stuff. I need "things" from God that are far more important than the ones that money can buy. I choose to spend my time asking Him to help me acquire those.