God doesn't want to just be 1st in our list of priorities; He wants to be at the center of everything, living in us throughout every moment of every day.
When Adam and Eve chose free will in the Garden of Eden, God allowed us to be independent, just as we have to do as parents to our children. And just like we don't "allow" evil to happen to our kids - it just happens because are independent - similarly, God doesn't "allow" bad things to happen...us humans cause it without any help from Him. But God does often use the evil we create for good.
Just like we cannot possibly as parents judge our kids based on their performance and chose the good ones to be rewarded and the bad ones to die...similarly God doesn't judge us, His children, either. He so wants us to all be rewarded that He let His son die so that we could ALL live. But as independent beings, we have to chose to accept the grace that Christ has provided for us in order to get that reward of eternal life.
God, Christ and the Holy Spirit aren't complicated things that need rules, laws and other man-made religious parameters. They are simple and want us to just love and embrace them, giving them our full faith. That's it...but we try to over-complicate it.