However, if anyone, secularist, atheist, Islamist or whatever, wishes to threaten my liberty and my nation, I will certainly oppose them, forcefully if necessary.
"I don't quite understand the logic that religion X should be given no space because its morally or spiritually incapable of resisting religion Y."
I'm not quite sure what you mean by this. Amongst those who are non-aggressors, all "opposition" or "resisrance" is a far friendlier thing, and takes the form of dialog, banter, love, blessing, humor, example, and reason. Against this form of "opposition" --- which is actually friendly persuasion, or even rivalry in doing good --- there can be, I think, no objection.