that's not biblical tongues and it is non-relevant to the subject
I also read where they learn songs phonetically
and it's a pretty big group...not just 2 members
I found the music 'snake like' and did not like her voice or intonations
No, it's an idiogloss which is similar to 'tongues'/glossolalia.
I'm not sure what other languages they sing in, so sure, it's very possible they learn the lyrics phonetically - there's a lot of Irish groups who sing particular songs in Gaelic, but have learned the lyrics phonetically. Sometimes you can tell, sometimes they do a pretty good job of it.
I'm not familiar with the group, so not sure how many member. The two people I referenced seem to be the 'key' members.
Music is very subjective - not all genres will appeal to all people.