No you cant. You most certainly cannot use a regional, almost now defunct group like the IRA, a single terror event carried out by a single man and lynchings from the 50's for your "moral equivalency."
Pretty much the ONLY thing you can use to justify any "fear of Christians" is that they might force you to get a crazy 80s haircut like Joel Osteen and to speak in tounges. Thats it.
And for EVERY SINGLE ONE of your "examples" of Christians using terror, Ill raise you FIVE examples of my own of Muslims using it. So dont even try to go there. Its a big loser for you..