There has to be some standards for The Church, they can't simply do whatever it is they want to bypass their own scripture. If it's traditions than it should have some grounding in scripture. I feel like there must be an objective way for when an assembly of people is compromised or not.
RC has a very unfavorable history regarding the bible. If the Pope, relic worship, symbol/statue worship, the divinity of Mary, Eucharist is any indication of counter scripture beliefs than that would be another reason.
Catholicism is also a sort of legalistic religious system similar to the Pharisees. I honestly don't want to offend The Catholics anymore than i already have, but it's sketchy to me, while at the same time, i have wise family asking me not to forget the Virgin Mary. Matthew 12:22-30 brings an interesting point, but there must be a limit to doing something, and placing Christianity on it to void the rest, like being a Christian Freemason, Mormon, Jehovah Witness or Christian Zionist.
I don't think that the bible explicitly contains every answer (one example would be masturbation not being explicitly stated, but generally accepted that it's not christian), but it should be the foundation since it's the religion's scripture.
The bible is the word of God, it's given by God, it's not a man's doctrine. I'll do agree that faith is important to having a good relationship with God.
They take issue with it because they're worried about my soul.