Is it possible to wire a VoIP adapter to all the landlines in the house?

If I disconnect the wires that lead into the house from the POTS terminal outside, they will have no input. Then can I connect the output jack on the back of my VoIP router to any landline jack in my house to have VoIP to every landline jack?

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1. Will there be a problem if I connect the VOIP adapter to my cable modem instead of my wireless router?
2. Can I use my laptop to distribute my broadband to a voip router through the ethernet port?
3. My SAP2102-R Voip adapter is not working. Can I buy any VoIP adapter from inernet and make it work?
4. How can i bridge my wireless connection at my hotel on my laptop to a VOIP adapter via ethernet cable?
5. How do I use Skype and another program to make free VOIP calls to landlines?