I am a follower of Christ (without Paul's interpretation) and I agree with this. In my worldview "worship" is not singing songs or virtue signaling on the internet what a good little Christian you are no it's what you do with your actions. Some of the most horrible people I have encountered gather in church on Sunday and some of the most generous people I have met are also degenerates... Yes there are obviously exceptions to both and that's the point: your religion doesn't make you the default good guy. Your actions are what matter. In the end, Jesus judges us all individually and on His terms. No one else will have final say in what happens so yeah you're right to be leery of those who boast about showing up to church every Sunday.