You'd be amazed that some not considered to be Christians actually have more faith than Christians who proclaim "I believe" on Sundays. This was also true when Jesus was physically down here on earth with us. Jesus came across some people who were not considered to be of God, but Jesus was amazed at their faith. (Matthew 8: 5 - 13; Matthew 15: 21- 28)
So, what is faith? Faith is belief, but it's more than that. In addition to belief, it's a knowing, but it's even more than that. It's also an absolute certainty. More than that, it's an expectation that what you know will come about, especially with God by your side.
One simple demonstration of faith is the example of you having strep throat and your doctor gives you the drug Amoxycillin. The drug is more likely to work if you have faith (a knowing and an expectation) that it will work. Believe it or not, it has actually been shown in studies that your expectation (or faith) in a drug actually can affect how well it works on you. They call this the placebo effect in science. Some studies have even shown that your negative expectation (or belief that the drug will not work) may actually decrease the effect, or effectiveness, of the drug.
Faith is a knowing and a certainty of something even though we have not seen or experienced it yet. In the analogy of the Amoxycillin drug, you would have faith that the drug will work even though you have never taken it in the past. If only we can apply this faith when it comes to God.
Your faith in God (your absolute knowing and certainty of His existence and your expectation that He is with you as you incessantly talk/pray to Him daily) will allow God to work in your life. When you lack faith, you block God from working in your life. Then you say, "There is no God in my life," and you would be right, but that's your fault.
Whether God works in your life or not, it's up to you. He is ready to give when you are ready to receive. You have to be receptive and have faith deep within you subconsciously, consciously, preconsciously, unconsciously, and whatever other levels of mind there are. But this is the tricky part - getting that faith ingrained deep in you at every level. (It's not just saying you have faith, as many do but it's just all talk.)
To help you with getting the faith you need deep in your mind and heart at every level, I strongly recommend that you start with the following readings or videos for just 15 minutes each day (or longer if you can):
Choose one of the following to do for at least 15 minutes a day:
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