Well, to be fair, Jesus was the central figure of the religion of the people you're talking about and for a long time outing yourself as a non-believer was "problematic" for your well-being and status in society. Even today in the US politicians know they need to demonstrate their Christianity to become president -- I doubt we'll see an atheist, Jewish, Hindu or even Muslim president within my lifetime (I'm 31).
Also, religious dogma largely lives separate from science and philosophy. It is true that many aspects of what "Christianity" is have been defined by consensus in the Vatican Council (including what scripture -- and which specific version of that scripture -- is considered canonical) and some Christian churches have been adjusting their dogma since (e.g. the CoE has become more accepting of homosexuality, the Catholic church has accepted evolution as factual). But saying "religion has undergone strenuous debate" is a very romanticized view of history.
Not to mention that much of Christian theology/philosophy foregoes the possibility that any other religion might be true to the point where Pascal's Wager only works if you supply the premise "All other religions and sects are definitely wrong" (i.e. you can't accidentally insult the "True God" if you submit yourself to the Christian God and turn out to be wrong).