As I'm sure you'd agree Narkissos, there is no such thing as religious truth or atheist truth - there is only truth, untruth and the unproven (which will eventually become either truth or untruth).
Of course subjectivity makes life worth living, our tastes in art, music, food and even religion are all different but each can bring pleasure or happiness. If religions were viewed in the same light as literature or art in that there was no right or wrong just a matter of preference I would not object so much. No one says "Matisse was right and Picasso was wrong", it doesn't work that way. But religion is so different.
I'm not so sure. I would personally avoid the notion of "truth" in this discussion, but arguably it can extend beyond the narrow concept of scientific truth, i.e. conformity to observable facts. I would submit that one can speak of "truth" in religion much like in art (note that only in modern times we consider those "fields," as many others, as totally distinct -- and a sociologist might find that they are not that distinct after all).
Maybe the "truth" of a religion has nothing to do with its conformity to scientific facts (e.g. those of history, paleontology etc.; the "best" religions may be those which avoid any interference with science) but to its ability to provide a satisfying self-understanding to the (individual or collective; mostly individual now) subject. In that way a religion could be "true" or "false" too. The JWs, for instance, could be given a low level of "religious truth," not because of their unfortunate incursions into the scientific field (e.g. 607), but because they leave many of their own adepts religiously unsatisfied. Because so many people become and stay JWs, not because of subjective conviction, but for fear it might be the objective truth. In sum, a "false religion" in the sense of a religion lacking religion.
However, do you think that most believers would accept that their beliefs are subjective? That they are held through personal conviction despite independant objective evidence that those beliefs are false?
In cauda venenum?
Truly religious beliefs imo can't be "false". When they are it is because they are not religious enough.