It is not like liberals would created religious colleges. Religious colleges were created by evangelicals and they have rules that explicitly punish things like "woman having male visitor" or "being gay" or "not being religious". If what you want is ideological purity of evangelical Christianity, then yes, you have to create own institution. Which is exactly what conservatives did.

Because it is extremely valid for other institutions and students to NOT be subject to the above. They were not kicked off other universities and less radical Christians still go there. Issue was that other universities did not punished non conservative thought and behavior enough. These conservatives do not want to share space with other nor to welcome anyone except those who are as conservative as them.

Your argument is typical "up is down and down is up" reversal. Conservatives want to create their own segregated spaces, because places that accept and tolerate non conservatives are just not acceptable to them. Somehow that is framed as problem with those other places not accepting conservatives (meaning not punishing non conservatives enough).