without having any idea of the validity of the message you heard on the radio, or the credentials of the speaker, it sounds to me like the speaker is suggesting that you can manipulate God if only you have enough faith.
I would suggest your faith cannot rest on whether or not you get an answer to your prayers that is satisfactory to you, but on the reliability of God’s promise and trust in what he has revealed. You either believe God’s word or you don’t. You either believe the Catholic church has been entrusted with preserving and handing on that Word, protected and guided by the Holy Spirit, or you don’t. It is an act of the will to make that profession of faith. The rest is obedience and humility, and continuing to pray, even when there do not seem to be answers to your prayer. It also means that petition is only part of our prayer, which should begin with praise and thanksgiving, and contrition for our sins, and only then move to asking.