Should You Pray for Material Things

So many Christians Say they know their God; however, if they had to go toe to toe, for instance with a Jehovah Witness, in the scriptures they would fail.  How well can you go to the word of God and prove your God is: God the father, God the Son, and God the Holy Spirit.  Is the trinity real.  Was Jesus just a prophet or is was he God manifested in the flesh?  Or can someone make you stray from your faith.