No.

You cannot be a citizen in 3 months, not unless you get in on a particular type of program (generally having a lot of money that you're going to promise to invest...generally a quite sizeable sum.) or getting married to a citizen, etc

For Switzerland, say, you will have to live there for 13 years and not just be there on repeated tourist visas because you don't accumulate 'citizenship time credits' that way. Which means you'll have a have a job for that long which means you'll need a sponsor or sponsors.

There is an interesting wrinkle to the Swiss situation where even if you live there there long enough your neighbors can still vote to not let you become a citizen.