UNWatch have their facts straight, but their interpretation can be debated.
The number 46 seems correct. But whether the decisions are "against Israel", and whether this indicates an anti-Israeli bias is a matter of opinion.
Did UNESCO pass 46 resolutions regarding Israel in 2009-2014?
I'll ignore, in this section, the question whether these resolutions are against Israel.
UNWatch's fact sheet, provides this data, with references to the actual resolutions - 10 decisions in 2009, 10 in 2010, 12 in 2011, 8 in 2012 and 6 in 2013. This adds up to 46 (without 2014).
Since they provide references, you can verify these numbers.
For example, the fact sheet claims that 8 such decisions were taken in the 181st session and 182nd session. The 181st session's sections 5.III, 12, 47 and 59, as well as the 182nd session's sections 5.II, 15, 54 and 55, discuss Jerusalem, Gaza and/or Palestine - my count matches the claim.
In addition, 182ex section 52 is about accepting Palestine as a member, and 181ex section 17.I is about establishing a BIOmics training center in Israel (part of a list of different centers to be established aoround the world). These aren't counted among the 46.
I did not check all of the data, readers are welcome to verify further.
Are these decisions against Israel?
Here it becomes a matter of opinion, not fact.
The language used in UNESCO resolution uses many words to say very little.
For some resolutions, it's hard to say if they're against Israel:
- 182ex 15.2 - safeguarding of the cultural heritage of the Old City of Jerusalem - from what or whom?
- 181ex 12.4 - concern as to the obstacles and practices, unilateral or
otherwise, affecting the preservation of the distinctive character of the Old City - what obstacles and practices? Is anyone to blame for these?
One may assume that since Israel controls Jerusalem, it has the power to do either good or bad, so concerns are probably meant toward it. But that's reading between the lines.
In some cases they criticize Israel more directly:
- 182ex 5.II.9 - deep concerns regarding the decision taken by the Jerusalem District Planning and Construction Commission - the commission is a branch of the Israeli government.
In a more recent decision you can find blunt Anti-Israeli claims, with expressions such as continuous storming of Al-Aqṣa Mosque/Al-Ḥaram Al-Sharif by Israeli right-wing extremists and uniformed forces. I think this claim is Anti-Israeli whether or not it's correct (they could use neutral language, such as "repeated entries by Israeli citizens, despite the Waqf's objection, accompanied by Israeli security forces").
The resolutions contain many references to other documents. Perhaps reading those can reveal the intention behind the vague texts, and whether they blame Israel.
Is this a bias against Israel?
UNWatch claims that in this period, only one resolution was made against another country (Syria). It's much easier to verify the existence of resolutions than their absence. In the resolutions I read, very few refer to a specific country, and I found no criticism in any of them (admittedly, the way the resolutions are written makes it hard to spot criticism).
It does seem that UNESCO deals with Israel/Palestine disproportionately - much more than countries that are larger and suffer from more severe crisis.