Juule, the link you give doesn't say that Christians destroyed the Mouseion or it's daughter-library at the Temple of Serapis. It merely says 'if, indeed, the library was destroyed...' . There is no definitive evidence that the library (if, indeed, the library was housed in the temple, and if it was destroyed, neither of which is certain) was destroyed by Christians. Quite the reverse.
Valetudinaria: as I said, the wiki entry casts doubt on how many there actually were, and what their function was.
Ashoka is certainly referred to in the wiki entry. But the link you give, Jules, just collects together a list of myths and undated, unverified assertions.
Hypatia: was not murdered by Cyril (and Theophilus did not destroy the library of Alexandria). There were both Christian and non-Christian Neo-Platonists, and Hypatia was known to be close to Christians. The article you link to is a farrago, and draws upon a historically quite unreliable and inaccurate book.
I agree there were institutions of learning in medieval Islam. However, the first institutions that called themselves universities, and that were the ancestors of modern universities, were Christian institutions.
The Renaissance did not come from Islam, although it is true that there was a great deal of knowledge-exchange between Christian and Muslim scholars.
Re taxes: and where did the concept of those who have giving to those who have not come from? Taxes to support the poor are radically different from ancient forms of taxation, which were mainly used to support the ruling elite and fund the military.