That was an interesting article, particularly this quip: "Such movements have been observed among a number of religious groups, most notably among Jews, Muslims and Hindus." I would argue the Jews already serve the same God as I do, they don't have to change anything except believing in Christ as the Messiah and being born again of Him. In fact, I would argue more Christians need to embrace our Jewish heritage and start observing some of the High Holy Days that God commanded, particularly Passover. But I digress.
Reading Abba's post gave me some conflicting thoughts. At first I thought about Missionaries wearing Burkahs and I instantly thought of Leviticus where God basically said over and over "Stop acting like the pegans". But then his point about Daniel hit home. Be a Jew to the Jews, a Greek to the Greek, and a Gentile to the Gentiles. That being said, I think intent has a lot to do with it. The missionaries, I would argue, are not what this article is talking about. The missionaries are there to make converts, and they adapt cultural norms that have religious backgrounds in order to make that task easier.
I think what this article is talking about is people who get converted but keep the traditions and ways of their old faith, I would say this is wrong. Baptism was all about making a public confession of faith, where everyone could see you. I think when you convert it should be time to stop the ways of your old religion and take on the ways of Christ. This is obviously particularly true if you are doing anything specifically forbidden, such as having false idols in your home.