Let me just start by saying that if you are contemplating a prenup then you should not be getting married yet. I would never consider a prenup because it cause trust issues because your wife wouldn't think that you trust her, and that's not the feeling that you want her to have.
Second...listen to God and let him guide you to the right person. If your relationship is centered around Jesus, your relationship will not fail because of the grace of God. If you are a Christian, you should be looking for a genuine Christian woman with the same values as you.
It is hard to find the right woman, but if you let the Holy Spirit guide you, you will not fail.