I’m sure it’s a sin and one that everyone does and will do again.
The non believers and the anti church types often complain about hypocrites at church. We most certainly are. One of the apostles certainly was:
36 Simon Peter asked him, “Lord, where are you going?”
Jesus replied, “Where I am going, you cannot follow now, but you will follow later.”
37 Peter asked, “Lord, why can’t I follow you now? I will lay down my life for you.”
38 Then Jesus answered, “Will you really lay down your life for me? Very truly I tell you, before the rooster crows, you will disown me three times!
Peter did indeed deny Jesus three times before the cock crowed.
Regarding those that complain about hypocrites, there are hypocrites, literally everywhere. While they might use it as an excuse to avoid church, it doesn’t seem to keep them out of the mall, movie theater, restaurants, etc., but they use it as an excuse not to go to church.
I’m kind of a wimp with the whole hypocrite thing. I try to never speak in definitive terms about anything, particularly moral situations. In some ways, that’s a good thing, sometimes though, just wishy washy.
All we can do is try to be better. We can ask for god’s assistance in making us stronger to be able to live better lives.