An Unavoidable Circular Argument by Roman Catholics to Push Their Manmade Traditions

In an attempt to defend their traditions which Jesus calls in Mark 7:8-13 as rejecting the Word of God in order to keep their manmade traditions, I am amazed at how circular arguments are made.  I used to spend time arguing with these people though right now, I prefer to leave them alone because arguing with them makes no sense whatsoever.  I'm better off preaching at the pulpits and sharing Gospel tracts than wasting my time in foolish debates.  Now for some examples:
The sacred oral tradition isn't polluted because the Bible isn't polluted. The Bible is the result of inspiration of the Holy Spirit through oral tradition. Jesus did not write but preached and many years had passed before the apostles began writing. Oral tradition came first before enscripted tradition which is the Bible.

However we read this NEXT very contradictory argument:
The Bible came from oral tradition, thus if the source is erroneous, the result is also erroneous.

There marks a serious contradiction that you need to deal with.  First, the argument is that oral tradition isn't polluted because the Bible isn't polluted but how on Earth can the Bible be erroneous if it isn't polluted?  That's a very round circular argument to defend their tradition.  To be honest, this is really getting VERY erroneous.  The argument goes from Bible to tradition to Church then BACK TO BIBLE which now they may have said contains errors.  What is very stupid is that while they say you can't trust the Bible but they really blindly follow the Pope's words as divine and inspired which had resulted to these issues like Purgatory, Marian doctrine, celibacy and infant baptism.  Many times, Roman Catholics reject Sola Scriptura to keep their tradition like the Rosary, use of graven images for worship, idolatrous feasts, etc. they are all manmade, not Biblical tradition.

The argument goes from now they say the Church is infallible because the Bible says so and then to goes back.  Arguments are supposed to be linear, ending with a definite conclusion that should be like this that the Church UPHOLDS the truth of the Bible and the Bible is NOT right just because the Church says so but the Bible is right because it's the truth that God has put in it!