I'm pretty sure the standard of those nations doesn't depict either Jesus or his bloody beating heart. Diversity is the key to economic and political evolution.
The authors general assumption is that while each state has its own unique relationship due to historical circumstances, there will be a greater harmonisation in the long run.
See also Lisbon Treaty Consolidated version of the Treaty on the Functioning of the European Union:
Article 17
(Although the honourable judges in the ECJ might yet disagree with me on that, or at least presume that they are the ones to give the ultimate interpretation of the Convention rather than the ECHR)
Secondly - and maybe I had not made a clear enough distinction - the overall legislation regarding this relationship of Church and the countries is not going to change fundamentally - and gave the example of the text from the Lisbon treaty.
Therefore there is no planned greater harmonisation of European- State- church -Relationship, and the Crucifix (or Church Tax) regulation will continue to be dealt with on a member-state basis.