Underdog,
What you are seeming to forget is that the scripture you ask for wouldn't be available to you had it not been for The Catholic church. We happen to be the institution that put the canon together.
The early church fathers chose the books that you have in your bible out of hundreds of writings and documents. We have what is called "Sacred Tradition", this means we have practices that have been handed down from generation to generation directly from The Apostles of Jesus Christ.
Also try and remember that you have like 7 less books than us in your Protestant bible. They were removed by Protestant reformers in (I believe) between the 1500's and the 1800's sometime. The exact date I cannot remember.
Again I will emphasize this; you do not have scripture to support The Trinity, yet you believe in this right? There are some things that become "matters of faith". In the words of Martin Luther himself "It is an article of faith that Mary is Mother of the Lord and still a virgin". For me it is an article of faith that the prayers of our Saints in Heaven are even more powerful than the prayers of a righteous person walking here on earth.
If you choose to be like doubting Thomas and say "I must see it to believe it" then I am afraid that nothing you see here will wind up being good enough for you. I have faith that those who came before me knew what they were doing.
God Bless you and give you His peace on your journey toward the Truth.
Christy