Mark 12:30 RSV
and you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.’
I feel that I’m sinning when ever I fall short of this commandment of Christ, such as when I used to watch a football game.
LOVE!
In the sense that we normally think if sin - the answer to your question is “No” you are not sinning when you do not Love God as much as you can. If for no other reason than the fact that what we “can” (are able to) do changes throughout our life. We just have to keep on trying our best.
Now to dige a bit deeper…
I think it useful to start by looking at a couple of the Greek and Hebrew words most often translated as “sin”…
Chata’ (Hebrew)
to sin, miss, miss the way, go wrong, incur guilt, forfeit, purify from uncleanness
Hamartano, (Greek)
To be without a share in; to miss the mark; to err, be mistaken; to miss or wander from the path of uprightness and honor; to do or go wrong; to wander from the law of God, violate God’s law, sin
(Definitions from Strongs concordance)
We can see by this that “sin” can have a broader connotation than simply acting contrary to God’s Law. If we are on the wrong path, missing the mark etc - then certainly we are, in a sense, sinning - that is, we are headed in the wrong direction.
Perhaps this is the sort of thing that you are feeling and are worried about.
If so - then I would suggest you think of this matter differently.
Your concern is not so much that you don’t love God as much as you can - but simply that you desire to become more perfected in your Love for Him. This is a good thing and something we are called to do.
What we must recognize in this is that we are talking about growth…Growth in Love…Agape…and this takes time.
Like the person who seeks to run a marathon, or lose x number of pounds it takes time, discipline, determination, commitment and an realization that we will stumble (repeatedly) as we struggle toward the goal.
BUT - -
So long as we are focused on the goal…we are not on the wrong path…we have not missed the mark…we have not gone wrong…we have nor forfeited anything…so that when we stumble, we pick ourselves up, apologize to God and get back on track…
Hope this helps a little
Peace
James