Nothing seems to irk a Catholic as much someone who has confidence in the promises of God, that those promises are for the here and now and that we can have confidence to boldly approach the throne of grace to find help in our time of trouble.
God is truth and cannot lie and our not trusting or believing His promises to us that He saw fit to record in Scripture for us is essentially calling God a liar. It's saying that we know better than God and that what He's promised us isn't true or trustworthy.
Thank God that He did not leave us as orphans but gave us the Holy Spirit, by whom we are sealed until the day of redemption, so that by Him we can cry out Abba, Father.
Philippians 1:6 And I am sure of this, that he who began a good work in you will bring it to completion at the day of Jesus Christ.