I mean truth about God and His commandments; can we know for certain that God exists, how do we know that His commandments are the truth, can we completely know whether or not they are the truth. I completely trust in God, but I can’t put my thoughts properly into words to respond to my classmate, so thats where I need help.
OK.
The Catholic Church teaches that the existence of “God” can be known by reason alone reflecting on creation. Traditionally there are 5 arguments (Aquinas) but they are pretty heavy (and many modern philosophers diasagree) and that is not really the point.
For myself I find it hard to believe that a mechanical wristwatch washed up on the beach was accidentally made by blind forces of nature itself. I believe in an intelligent and personal Designer. I identify that person with the Christian God of the Hebrew people in the Christian Bible.
The Church also teaches that the Commandments involving natural man (ie the last 7 commandments) express dictates of objective “Natural Law.” “Natural Law” refers to the 'rules" human beings can all theoretically find in nature/creation simply by reflecting on our own experiences and using reason.
Now that is the ideal. In fact of course all humans are limited in their use of reason for a whole variety of causes. The major causes are upbringing (culture, religion,bad scoiety, bad example, bad teaching), constitution (not everybody is born brainy) and sinfulness (if we do not have a pure heart we cannot see clearly).
This is why the Church also teaches the importance of “Revelation” (ie Religion). Revelation is God’s help to humankind in learning about Him and Ourselves and what we do to remain in his friendship and also be true to our own natures and so we all be as happy as is possible in both our personal and societal lives.
The greatest reveal-ing that God gave us is the person of Jesus and his teaching.
That is what the Church attempts to pass on without change or alteration.
Of course even that is muddied. How do we know which is the most faith-ful relgion, the most faithful Church?
In the end we don’t know except by using our own reason/conscience to “test the waters” as it were when it comes to decide who or what to believe in.
Yes its a work-in-progress and it doesn’t stop just because one has officially chosen a Church.
In the long run it doesn’t really matter whether we are actually in the “most faithful Church” or not so long as we follow the lights God gives us with a pure heart regardless of the cost.
You do not need to convert your classmates - simply witness to the truth as you sincerely try to follow it. In the end it is not maths but faith so you cannot expect others from different environments to get it or agree with your position. If they are true friends they should respect that you are searching and this is your best position as you see it at the moment.
Likewise your classmates should not be trying to agressively convert you. If they do that is often a sign of insecurity on their part (if people don’t conform with us then that makes us feel uncomfortable) or a love of power (which isn’t exactly Christian)…which is another form of insecurity.
Providing an explanation for the faith one hold’s is an ancient definition of “Apologetics” - which is exactly what you seem to be talking about here.
Good luck.