ok this is a bit of a non-answer... i would characterize this quoted portion above as maybe a step or two above "they started it, that's why"... and it doesn't answer the basic question...
if you care nothing for the bible, and it's nonsense, and the like... why would anyone care enough to go into criticizing it?...
for just one example, i could care less about the books written by Shirley Maclaine, i find them to be nonsense... i wouldn't endeavor to even address the stuff... in fact in literal truth this is the first time in my life i have ever typed/mentioned her name in this way, or mentioned her books, on the internet or IRL, and i did this only for the sake of example...
if i was spending my time going into critiques of her material as nonsense and baseless stuff, repeatedly making what i thought were clever forays into dissecting her ideas, and the tenants of spirituality she espouses, if i spent time lampooning those who follow her ideas as profound spirituality, who think her so enlightened...
if i did these things and etc... anyone with a modicum of wisdom would know something was up, i was protesting too much, there was more to the issue than me merely finding her works nonsense... i may use the fact that she writes best selling novels, or has many people who follow her advice and tenants and etc. as some excuse for my oddly focused energy on trying to 'shoot her down'... but there is no escaping how odd, telling, and out of place my use of my time and energy focusing on her stuff would be... even though i may delude myself, anyone with any real intelligence would see through it...
in your case more directly, if 'they'(Christians) are trying to influence public policy, for instance, then it is merely a political action concern... one may start a political action committee of their own, to counter the political influence, they might not vote for candidates and representatives who subscribed to that stuff... etc... there simply is no logical or meaningful reason to begin on some critical analysis of the book/books of the religion...
now you completely avoid my point, which is, i see almost no intelligent and well informed criticism of the bible... it is always done by those who are almost completely ignorant of the text... and this from scientists, so often, who espouse 'peer review by informed colleagues' as requirements to validate their ideas... yet this same crowd suddenly finds completely ignorant criticism of a thing like the bible as 'perfectly reasonable'... a painfully obvious, and complete contradiction of motives, logic, and methods... it sticks out like a sore thumb...
"unlike most Christians i thought about religion" true, most don't...
but anyone who has actually studied the bible knows full well it is an anti-religion book... the simple fact is... MOST, 99% of the 'religious', the 'Christians', church goers of every flavor, have never studied the book... a smaller percentage than that of 'critics have actually read the stuff...
"growing up in a Christian ethos" sounds more like you have unresolved issues with your family dynamic, and parents, than anything to do with the actual text of, and teachings in, the bible... and this flavour of 'justification' is what you find most of the time in this 'anti bible' type of approach... it's odd, out of place, illogical, and telling...
"why waste further time on the bible"? ironic you point out my simple assertion for me... why are you "wasting time" posting about something you claim to be nonsense?
and please, no more "because they started it" circular logic...
so people "who believe they have all the answers because they have studied a copy of their holy book"... is why people engage in VERY poorly informed, frankly almost completely ignorant of the subject matter, criticism?... putting out such energy and time 'shooting down' the bible... again it's more of a "because they started it" type of idea... like a dad may hear as a response to "don't make me stop this car"... "they started it" comes from the back seat...
that is nonsense and another non-answer...
you might think a bit on what you describe as 'unneeded' advice... particularly with me seeing the things you so confidently state the bible 'says' on various topics...
(note: i cleaned up the edit you did, as to keep tags consistent, and enhance readability and the flow of ideas)