R. Feldman writes
R. Eliashiv believes that they can be rightfully categorized as heresy (apikorsus) ... I believe this is because they diminish the honor and the acceptability of the words of the Sages, which has the status of apikorsus.
Rav Eliashiv added, “Even if he is one of the lamed vov tzadikim, these books may not be taken into a Jewish home.”
In other words, to say that Chazal made a mistake in science is heresy in 2005. If we take this idea to it's logical conclusion, not only can R' Slifkin's books not be taken into a Jewish home, neither can the following sefarim as they also contain the same heretical ideas. We should need to censor these sefarim.
1. Teshuvos HaGeonim 394:
Our sages were not doctors and said what they did based on experience with the diseases of their time. Therefore, there is no commandment to listen to the sages [regarding medical advice] because they only spoke from their opinion based on what they saw in their day.
2. Rambam, Moreh Nevuchim 3:14:
Do not ask of me to reconcile everything that they (Chazal) stated from science with the actual reality, for the science of those days was deficient, and they did not speak out of traditions from the prophets regarding these matters
3. Rambam Hilchos Kiddush Hachodesh where the Rambam implies clearly in a number of places that Chazal made mistakes in astronomy
4. Rabbeinu Avraham ben HaRambam, Ma'amar al Derashos Chazal:
…The great superiority of the sages of the Talmud, and their expertise in their explanations of the Torah and its details, and the truth of their sayings in the explanation of its general principles and details, nevertheless does not obligate us to defend them and uphold their views in all of their sayings in medicine, and in scientific knowledge
5. Ramban, commentary to Vayikra 12:2
"When a woman gives seed (tazria)" (Leviticus 12:2) …They said with regard to the meaning of this, "If the woman produces seed first then she will give birth to a boy..." (Talmud, Niddah 31a). And their intent was not that the child is formed from the seed of the woman, for a woman, even though she has ovaries like the testicles of a male, these either do not produce any seed, or the seed does not do anything for the fetus; but they said "produces seed" with regard to the blood of the womb that is collected at the conclusion of intercourse in the mother and attaches itself to the seed of the man, for according to their opinion the fetus is formed from the blood of the woman and from the white substance of the man, and these two together are called the "seed"… and the opinion of the doctors regarding formation is likewise. But according to the opinion of the Greek philosophers, the entire body of the fetus is formed from the woman's blood; the man contributes nothing other than the force that is known as hyuli in their language, which gives form to the substance… and if so, the word tazria is like, "[as a garden that] sprouts forth its seedlings" (Yeshayah 61:11)
The Ramban as well in Bereishis 9:12 and Vayikra 18:19.
6. Eyn Yaakov where he quotes the above letter of R' Avraham Ben HaRambam in the introduction
7. R' Hirsch
8. Pachad Yitzchak, entry “Tzeydah.”
9. Michtav M'Eliyahu p. 355 that the Sages never erred in the final halacha, although they may have erred in the reason they gave for it.
I am being very serious. Kefira is Kefira and according to what R' Feldman writes all of the above sefarim have kefira in them and therefore how can I keep them in my house? Did they censor these sefarm in in Ner Yisrael?
I am waiting for someone to seriously address this issue.