When you have had a bad day - So when you have ignored God, lived for yourself, done things wrong, failed people maybe even hurt people then it is easy to think that we are far away from God and that he must be rejecting us. However, this is not true because Christianity is not about us being good enough for God but rather about Jesus dying on the cross so that we can be forgiven for all that bad stuff. So the bad day actually has no bearing on our status before God because our status before God is all about Jesus not about the levels we attain.
On the flip side when we have had a good day - So when we feel we have managed to stay focused on God, when we have lived for him and for other people, when we have served people and helped them it's easy to think that we are closer to God and that he must accept us now. However, again this is way off because we are never good enough to hit the perfect standard of a perfect God and so our status before God is again all about what Jesus has done rather than how good we have been.
Now it is worth me saying that I consider this to be absolutely true and essential to anyone's understanding of what it means to be a Christian and on how we can come into a real relationship with God. However, I just want to look at it another way.
Whilst good days and bad days are not the determining factor when it comes to my relationship with God they do matter. You see what arguments like this are doing is looking at all from God's point of view and how he relates to us. However, if we for a minute look at it from our point of view I think we can make a distinction. Let me explain.
Good days - If by a good day we mean living the way that God intended then the way you feel about life and your day will and should be different if you have had a good day to if you have had a bad day. So for example on Thursday when I managed to study God's word deeply, to talk to God honestly, to serve God at youth work and to relate to people according to the grace God has shown me I felt better about the day, I worshipped God better and I enjoyed my life and the things God has given me more.
Bad days - If by a bad day we mean living in way contrary to that God intended then the way you feel about life and your day should surely be different from that enjoyed in a good day. So for example on Wednesday I didn't manage to relate to people well, I didn't talk with God honestly, I didn't study God's word deeply and I didn't serve God well and the way I felt about that day was worse because of that. I did not enjoy the day as much, I didn't have the same satisfaction out of it, I worshipped God worse and I felt worse about that day.
So whilst good and bad days might have no bearing on our status before God they do have an impact on our ability to enjoy and find satisfaction in the lives God has given us. If God really exists, if he really made this world and if the Bible is his revelation to people then living his way must lead to a better life than living opposed to it. My experience tells me that there is a difference between good days and bad days even if God, in his incredible grace, decides to see no distinction and love me regardless!