Why Do I have Idols?

Yesterday I was remembering to remember the faithfulness of God. In the OT I have several verses that God says the children of Israel turned away from Him to idols because they did not remember all the things He had done for them.
We have been having a lot of discussion in our house about idols of our hearts and how they get there...and this whole thing about forgetting God or neglecting to remember Him and what he has done keeps coming up.
Perhaps one of the most convicting and "scary" passages to me is I Corinthians 10. Such a strong warning for us to flee idoltary, for idolatry is drinking the cup of demons...and we cannot drink both the cup of Christ and the cup of demons.
So, what are idols anyway? In this passage specifically the people were worshipping images that were hand made...they turned to those images to deliver them. They gave of their time, money, thoughts, hearts, desires, etc to those images. I don't have any graven images in my house that I am aware of, but there are some in my heart that the Lord has been revealing to me. In this passage God points out the sins that come out of an idoltarious person...revelry, scheming/evil plans toward others and living, sexual impurity, and grumbling. Hmmmm....grumbling....me thinks I feel very convicted. I keep thinking about how often the Israelites complained against the Lord and against the authority/leaders that God placed over them. I do that.
I'm beginning to think that complaining about anything or anybody is the first sure sign that my heart has set up idols...that my heart has forgotten God's faithfulness to me.
So many connections here in this one passage. I am going to continue in it for awhile. I am also finding out how very important it is to be studying scripture during the times my heart is "hearing" and seeing my sin. I have been praying that God would search my heart and show me the wicked ways...but it is so important that as sin is being revealed I have the eyes and mind of God...it would be so very overwhelming to me to see my sin through earthly human eyes. Makes me feel like there is so much to work on that I just throw in the towel and don't even try anymore. Don't even know where to begin. But if I continue to examine my sin through the lens of scripture and prayer I can see all the sin with eternity in mind. My perspective is just so very different.
Di