Hakatan- I have never seen a modern day posek prohibit davening in a dl shul, including dl men for a minyan, eating at their homes, drinking their wine… Whatever some of the gedolim have said in the past, which was also likely a response to the militant anti religion Zionism which does not exist in the same way anymore… Minhag Yisroel has clearly paskined against it… And to claim that dl Jews are in the same category as christians, reform Jews, conservative Jews is a terrible aveira. You can think that one of the positions may be heretical, which I also disagree with vehemently, but that’s still much much different than labeling the entire tzibur as OTD and idolators.
