Infant circumcision is only "mainstream" in the USA and in Muslim countries. It's estimated that about 80% of men in the world are uncircumcised, therefore the "mainstream" opinion is against it. The three main circumcisers are Muslims, Jews and Americans.

Circumcision of infants is rare here in Britain, and most of Europe. I believe it's illegal in Finland.

So, if you are talking about" mainstream" opinion, you really mean amongst American, Muslims and Jews. The rest of the world's overwhelming opinion is to leave men intact. This is Europe, Australia, Canada, New Zealand, South America and Asia

America is alone of advanced countries in performing infant circumcision.