I choose to believe in what works for me

 And this creates a mix of Science and spiritual beliefs in my life.

Then I apply the Scientific Method to both spirituality and science and daily living experiences. In this way I have a whole lot of hypotheses that are created by my own questions and people's answers to different questions in life. Everyone has their own balance of how they function and stay alive through living here on earth.

However, I find that the scientific method applied to literally everything tends to work best in regard to both spiritual things and physical things as well. 

So, you wind up with an almost infinite amount of hypotheses (your own and other peoples'). 

Then you over time try to prove the hypotheses that are most interesting or important to you. Through this process some hypotheses are thrown away and others become theories. And over time some of your theories become Laws (at least in your own mind and experience and actions).

In this way you refine what you believe over time by real experiences and move forward more surely through your lives in a better more holistic way that makes more sense to you than before.

By God's Grace