You are correct; I know from experience that there are many catholics who don't believe certain things the RCC teaches. You had said you were a defender of the RCC, so I assumed you believed things like the sinlessness of Mary. Please note that I wasn't stereotyping and that Mary's sinlessness is not a stereotype but a doctrine of the catholic church:
I reject the belief of Mary's sinless life, though I accept that Mary must have been a righteous person in order to give birth to Christ. I suppose as to why I defend the Church so much, I'll need to provide my background...
I live in the world's largest atheist country. The Catholic Church is illegal here so we meet undergound. If the authorities find us, the local police beat us up in front of our families, to make us ''an example''. If we do not abide to the state's secularist law (which includes forced abortions and sterlisation, eugenics etc), we are deported to ''re-education camps'' (gulags) where we are forced to renounce our faith through brutal torture and labour.
Perhaps it is the amount of persecution that we Catholics receive in China that has made me a little militant. I might not agree with everything the Church is saying, but I feel that I must defend the Church because there are so many Catholics being purged all around me...
We came together in accordance of friendship and tolerance, to spread love across China, and the state kills us one by one.
I don't know if I can forgive the CCP...and that already shows how sinful I am. The Catholics who are martyred in China do not put up a fight, they probably ask the Lord to forgive their persecutors (just like Jesus did) before carrying out their death sentence. But the CCP is just so evil...so evil.
Good for you!

It seems to me that you are a non-denominational Christian at heart. You don't believe everything the RCC tells you; you simply want to follow Christ.
I think that I can say that I'm a Christian first, and a Catholic second! I nearly always just call myself Christian (mainly because I like having the word Christ, makes me feel closer to Him), Catholic is just like an adjective to me. Since Catholic means ''universal'', I'm a ''universal Christian'' (nothing to do with the universalists of course). I believe that we should all be united in common belief, it does not necessarily have to be under the Vatican.
I agree with you about the quakers, they are peacemakers!

Once I saw the RCC's error, though, I knew that the One True Church must be unified not by any denomination, nor any set of church buildings, but through trust in Christ for salvation. There is still One Body in the One True Church, and there are people from many, many denominations in it: catholic, orthodox, and protestant alike.
I suppose that is the Church's goal to unify through trust in Christ. We do not want to push our views onto you, our goal is not actually to make you ''Catholic'', more importantly it is to welcome non-believers to Christ. Thanks to the missionaries of so many denominations working together, we have managed to turn Nigeria from a perdominantly Muslim nation to a demi-Christian one with a Christian president (who actually advocates a freedom of religion for a change

).
In the Catechism, it is noted that all Christians (Catholic or not) will of course be saved due to our belief in Jesus (that will never change, it is Christ's promise...not the Pope's). We also mutual respect with the Jews and Muslims, though I guess most denominations do (except the Westboro Baptist Church...they're always amusing to watch).
This is exactly why I don't adhere to any denomination; factionalism is sinful according to the Bible: Galations 5:19-20
It is sinful, for we are all children of God. This applies to not only denomination, but also country, race, culture etc. We shouldn't divide ourselves so much, we should look beyond the flesh and see the soul within (pretty allegorical but you get the picture). With all the wars and conflicts, this passage is being broken all the time.
As for the Church, it was predominatly factionist during the Catholic-Protestant conflict. Catholic France even hijacked the Vatican once and created the Avignon Papacy, in order for the Catholics to be more supportive to French interests. However I believe that politics and the Church aren't so close as they used to be, especially after Italian Reunification which saw the downfall of the Papal States (due to France not being able to defend the Pope due to the Franco-Prussian War) and the creation of present day Vatican City.
The Vatican now serves as an establishment for Catholics and non-believers to visit (at least we let everyone in, unlike in Mecca where you have to be Muslim to enter...quite a shame, I'd like to go there since it does look very beautiful). The Church remains apolitical, only striving for world peace and shunning extremist ideologies (such as totalitarianism).
I strongly agree with you about unity. I don't agree that the RCC has been striving for more unity recently. The immaculate conception and papal infallibility are recent doctrines and both are very divisive.
Well, as mentioned, I don't tend to really follow Marian reverence (but I still consider myself Catholic, the Church, hopefully, doesn't wholly rotate around Mary). As for Papal infallibility...if it were true, if the Church were truly the perfect Body of Christ, why is it that we've had so many bad Popes? Lol I'm not kidding, some Popes were actually beaten to death by the husbands of women who they cheated with! (Pope John XII met that fate..talk about adultery, guess John wasn't exactly martyred haha).
I agree!! Divisions that separate Christians are delusions, that's why the concept of the denomination must fall and Christians should be united back into a single Church. Unfortunately, it is a fallen world, so I don't see that happening until Christ's return and his millennial reign.
I also agree with what you said about devotion: followers of Christ are Christian, regardless of denomination!
Indeed, these delusions make us more divided. I suppose you're right, the Church's idea of uniting all Christians is too idealistic...regardless our life on earth is temporary, we'll all be united in Heaven. The church that Christ set up on earth was not supposed to be sectarian, it was supposed to introduce others to Christ and prepare for His return.