As for my definition of Christianity, whereever mine differs from Christ's I am willing to change, where it matches Christ's I pray that threat of death or hell could not dissuade me from it.
"Hier stehe ich. Gott helfe mir. Ich kann nicht anders."
Martin Luther was famous for saying essentially the same thing as you. After saying that at the Diet of Worms, he was declared "Vogel Frei," free for anyone to kill without sin. He would have probably been killed on the spot if he hadn't left the Diet early, before the decision was handed down. It was only the help of a powerful prince that saved him from later capture and punishment by kidnapping him on his way from Worms and hiding him away in Wartburg Castle.
BTW, I've been to the Worms, where he defended his theses, and to where he attended the Augustinian convention in Heidelberg.