Does cause- and -effect ever exist?

Talking about karma, can be really tricky. I am surprise by how this topic can be interpret into various religion belief. It may be adopted, but not created.

If i used the Sanskrit "karma" and "Samara" --- some may relate it as Hinduism or Buddhism belief. Also, the

But, if i used it simply in English " action or deed" and " cause and effect"--- it become more of a western practice. Christian concept of reaping what you sow from Galatian 6:7.
Both are the same.

It doesn't matter whether we believe that whether there's such a thing, but it is happening right without our consent. The very thing we are doing right now represent an act or a string of action--- "karma" and "deeds"
If Samara or "cause and effect" does not exist--- then why are we still doing what we are doing now? Since it will not produce any result anyway.

Let me quote a simple example:

Why do we eat? 

Because we are hungry, we need energy. ( cause)

What happen after we eat?

No more hunger, and we got body energy ( effect)

And this event is a cycle of action ( Samara)

" I  work hard because i want a better life..." ( this is cause and effect)

When doing good deeds, like charity, we want to believe that cause and effect does exist--- because the result is favorable. 

When doing bad deeds, like stealing, we deny that it exist--- because the result is unfavorable.

We get restricted by our own believe.

In the cycle of Samara and karma, there's not categories of positive or negative--- everything is neutral. You plant seed A, you bear fruit A. If you plant seed B, you bear fruit B.

The works of nature does not need our consent, because we are operating as part of it.  

When we create something, we eventually need to dissolve it. 

Creation- Preservation- Dissolution, that the basic cycle we are living with each day. We can choose not to recognize it, but the cycle moves on.