If the PotLuck (or the more pious-sounding, PotProvidence) is not tasty ... well, that's where I draw the line.
I think all of the meals I was served as a bachelor after service played a big role in my joining an OPC church a few years ago.
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I don't think any list of things at which I would draw the line would be exhaustive, but off the top of my head, the following are a list of things that I'd draw the line at, or in some cases would at least cause me to look elsewhere:
1. Lack of emphasis on preaching the Word. Some churches will lay aside preaching for weeks at a time in favor of various entertainments or singing, etc. The preaching must also be textual, but not necessarily expository in that every message has to be dedicated to preaching verse by verse through a particular book. Spurgeon was not an expository preacher in that sense.
2. Lack of commitment to congregational singing. In many churches this is due to having several choral anthems, solos, etc. that crowd time out of the worship service.
3. Use of manipulate practices.
4. The church having no statement of faith or confession to which the officers adhere. Or, if there is some kind of confession, the officers clearly having little or no regard for it i.e. what is taught or practiced is clearly at odds with what they say they believe.
5. On the other hand, I also draw the line at confessionalism taken to such an extreme that the confession and not the Bible is effectively seen as the final authority. I'll also include any church that is more bound to their traditions (whatever they may be) than what Scripture has to say on a particular issue.
6. A church that doesn't preach the whole counsel of God. Often this is because they are riding some hobby horse or movement, perhaps taking it to an extreme and neglecting other vital truths. Sometimes the thing being overemphasized is itself a vital truth that has been neglected, or it may be a pernicious falsehood. Today this could include the homeschool movement, KJV only, every sermon ending up being on the 5 points, overemphasis of a particular eschatological view, charismaticism and so on.
7. A church that is too inwardly focused and has no vision or effort toward evangelizing their community beyond bringing in a few other people who are also disgruntled with other local churches. On the other hand, a church that is so focused on bringing in new converts that it neglects discipleship and continued growth of the existing members is unacceptable as well.
8. This isn't a baptism thread, but as it is a non-negotiable for me, I'll also list that I would not consider a paedobaptist church. Other things I would look for are a church that is committed to Regenerate Church Membership i.e. one that practices redemptive church discipline. A lot of Baptist churches also practice what has been termed a late stage paedobaptism where children of 4 or 5 are baptized for the flimsiest and most unbiblical reasons.
9. Egalitarianism.
10. Of course all of the above assumes looking for a church that preaches and believes such vital truths as inerrancy, the substitutionary atonement, Christ's Virgin Birth and bodily resurrection, his personal return to judge the living and dead, etc.