I'm afraid that you have totally missed the point. Those people weren't worshipping Buddha. They were having a Mass in a Buddhist temple. The statue of Buddha was already there, and they just set up a small table in front of it to use as an altar. And they all sat around on cushions on the floor to give it the Mass a "Zen" feeling.
The unfortunate fact is that this kind of syncretism and ecumenism IS very common and widespread. Virtually every parish in the US has at least 1 Sunday per year when they have interfaith services and exchange pulpits with protestant ministers. We all know about the Buddhists in the basilica in Grand Rapids and the Hindus in the shrine of Fatima. Just in the last few days here on FR there has been a story posted about a Trappist monk being made a Zen master.
No one claimed that these people were worshipping Buddha, simply that they were participating in the widespread indifferentism that affects virtually every member of the Catholic Church these days, starting from the top down.
And yet, I've never witnessed this. I've never heard of this (until this instant). Virtually every parish??? BS!