When it is said that some sins are minor and some others are majors, this interpretation means that some sins are minor compared to other ones. Although no sin per se is minor. We have no minor sin, the sin is always major; because it is considered as the disobedience of Allah Almighty.
The holy Prophet (peace be upon him and his progeny) says:
‘Do not look at how small the sin is but instead look at how great is the One that you have disobeyed.’
source : erfan.ir