The current world congress system is that
You can only choose outcome A or B, and it first decides whether to have outcome A or B, then decide which one being the target.
The problem is that
1. you cannot downvote to maintain the current situation, and have to choose from A or B.
2. If you choose A then your vote count for every outcome of A, which may include outcomes that you're not willing to see.
For example, A: A certain Religion get culture bomb when building district. B. A certain Religion cannot spread.
You definitely want your religion to get A, while preferring B to target other religions when the final target of A not being your religion. However, upvoting A for your religion upvotes the whole A, helping A to beat B, and, in A your religion does not get enough vote, other religions get that bonus, nothing good to you.
Your vote, your works on diplomacy, although you vote for your goodness, it actually helps other religions to gain A, which is negative for your development. This design is bad .