Very interesting turns and contributions here! Just a couple things I want to address:
Isn't it reasonable to say that Christians themselves are the enemies of Christianity?
It may help to shed some light on this phenomenon. You could think of all us Christians as schizophrenic, in the sense that we have our own sinful nature as well as this new nature born in us, that none of us even
really know what it will be like when mature. The immediate reaction is always to respond in sin, so in that way we are enemies of ourselves, our Lord, His Father, each other, and yes, also Christianity itself.
And this is why you see us scrutinizing Scripture so much, because it is the only reliable guide we have to even
try to avoid all that mess. The most valid parts are readily understood by anyone, no special context or other considerations required, for example:
"Now the works of the flesh are evident: sexual immorality, impurity, sensuality, Galations 5:20 idolatry, sorcery, enmity, strife, jealousy, fits of anger, rivalries, dissensions, divisions, envy, drunkenness, orgies, and things like these. I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God. But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control; against such things there is no law. And those who belong to Christ Jesus have crucified the flesh with its passions and desires."
So all you have to do to be part of the solution is point out to any of us at any time when (not if, but WHEN) we're on the wrong side of that line. It shouldn't be necessary to remind us we've made ourselves enemies of our own selves and also of everything that is good, but if need be that can be in your arsenal too.
Jesus didn't come for those that are Spiritually healthy, but for those of us that are sin-sick. The Church is not a place to Glorify people that are already wonderful, but is a hospital in which to recover. And the only thing any of us have in common w/ the Lord, that grants us access to His Grace, is this faulty condition. That He took upon Himself willingly via the Cross, for the very purpose of having something to truly share with us!
Then the other thing: that "Dawkins/Hitchens gutter-level atheist" comment - does that help?