As a pagan I'm deeply respectful of other faiths. When you dig down to it, most creation myths, spiritual and religious stories overlap and are intertwined, likely throughout all cultures. As, indeed, are philosophy and science. The Celtic goddess Brighid, for example, has close connotations with the goddess Mary. Virgin births are a staple of Egyptian mythology: the Christmas Story didn't happen in cultural isolation. This is why there is no one 'truth', but a multiplicity of them.
IME, most of the objection to the monotheistic faiths I've heard emanting from some claiming a pagan spirtuality is to do with persecution of non-adherents, didacticisim, misogyny and attitudes to women. 'Churching' is particularly repugnant, as is the idea that menstruation is somehow disgusting. Or that 'Eve' is a scapegoat for the fall of humanity: I personally find 'Paradise Lost' - albeit its a derivative - a far more interesting read than 'Genesis'. The reappropriation of Pagan festivals, which are so many and so varied as to be untraceable, by Christianity is the least of the objections I've heard voiced to that faith.
To return to my point, something intrinsic within humans needs our stories in order to live. There have always been periods where secularism has been a dominant discourse, but where that happens, old stories are simply replaced by others. It's true to say that many, many humans across the history of our species have needed their stories, myths and spirituality in some primeval way. Who knows?, this could even have been key to our survival as a species.
I once read the phase, and it stuck with me: 'perhaps the very essence of the obscene is that we are nothing but bodies'. Modern-day humanists seem to have made their peace with that idea; some even find it liberating. But as a species, as a general rule, we have tended recoil from this. We want to think that 'meaning' consists of something more than merely organic matter.
Or, perhaps, there's another kind of peace which comes with never knowing for sure.