I'd answer this the same way I'd answer "Are questions from Atheists allowed here"
As long as the hostile posters are following the guidelines and rules, we should address them the same as we'd address a genuine seeker.
If they're not following the site guidelines, the behavior needs to be addressed. Whether you're looking at things from a secular perspective or a "Christian" perspective, rules, submission to authority, etc. are necessary.
Thoughts to keep in mind:
- Consistency is important. We can't allow "what we agree with" to be the standard. This isn't a "like-minded only" club. StackExchange sites aren't here to let us include only those that we like. They're here to provide objectively verifiable answers, where other sites give only opinion.
- This isn't a free-for-all discussion forum. It's a moderate (read - there are people with authority that are in place to make judgement calls) Question and Answer site.
- StackExchange sites all have consistent guidelines and guiding principles. We cannot allow ourselves to discriminate against others because we don't agree with them, but we can also not allow people to violate the established rules.
So again... Whether we agree with "hostiles" isn't the issue. I don't agree with many of the users of this site. many of the users of this site don't agree with me. But as long as we are playing by the rules, and showing mutual respect, and "agreeing to disagree" and avoiding pointless arguments over Truth, the bottom-line question is "Is this person following guidelines?" if not, politely explain the guidelines.
If that doesn't work, ask an moderator, or experienced user to help (flag, bring it up in chat, etc.) If that fails, it falls to the moderators to use the authority granted to them to enforce the guidelines. And if that becomes necessary, let the moderators do their jobs. They are the elected (or at least will be once the elections take place) designated authorities on the site, like it or not.