1.When asked about..., the vast/overwhelming majority of people say that …. But I think/view a bit differently.
2.When it comes to ...., some people believe that…. Others argue/claim that the opposite/reverse is true. There is probably some truth in both arguments/statements, but I tend to the former/latter.
3.Now, it is commonly/generally/widely believed/held/acknowledged that..... They claim/ believe/argue that ... But I wonder/doubt whether.....