There is an interesting pluralistic trend among many Protestants today to regard theology in general, and thus often theological difference as well, as unimportant.
Now, this isn't interesting because it's unique among 21st century people. It's not. (In fact, it fits quite well with secular culture!)
And it's not interesting because it's surprising based on their beliefs. It's not. (I argued that pluralism is a natural result of their belief in sola scriptura here.)
It's interesting because of why protestants exist in the first place.
On October 31st, 1517, Martin Luther nailed an open letter to the Archbishop of Mainz and and Magdeberg to the door of Wittenberg's Castle Church entitled "Disputation of Martin Luther on the Power and Efficacy of Indulgences", known today as "The Ninety-Five Theses".
After three years of dialogue, he was excommunicated. Then at the Diet of Worms, when asked to recant his beliefs, Luther famously stated, "Here I stand. I can do no other."
Luther took theology seriously - so seriously, in fact, that he was eventually willing to lead a major schism in the Church over it. The same is true of the other Reformers.
That's why the Protestant Reformation happened. That's why people broke off from the Church - because they took theology seriously.
When protestants today take the pluralistic attitude that theology doesn't matter very much - certaintly not enough to cause disunity among Christians - I have one question: So why aren't you Catholic? In other words, since you no longer seem to care about the reason for the existence of protestantism - theological difference - why not go to back to the Church that protestants split from? Remember that disunity is a serious place to be, especially if one doesn't have a good reason for it. Jesus' own words on unity:
"I pray also for those who will believe in me through their message, that all of them may be one, Father, just as you are in me and I am in you. May they also be in us so that the world may believe that you have sent me. I have given them the glory that you gave me, that they may be one as we are one: I in them and you in me. May they be brought to complete unity to let the world know that you sent me and have loved them even as you have loved me." (John 17.20-23)
Such protestants must realize that they are no longer just protesting the Catholic Church, but also the protestant Reformers themselves. They are protesting the protestants! Actually, given the denominational splitting that has spiraled out of control among protestants to what's becoming an incalculable degree, they are most likely protesting those who protested those who protested those who protested those who protested the Catholic Church.
And they are left now with little connection to Christian history, whether that of the Catholic Church or the Reformation. They find themselves having more to do with 21st century post-modern secularism than anything Christian.