Flattery

 For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naive.
Romans 16:18 ESV
https://bible.com/bible/59/rom.16.18.ESV

'Such persons' are those who cause divisions. Not everyone though who calls themselves Christians are united in faith in Christ. Some pay Him lip service but fail to live according to His commands.

Some people claim that simply professing faith in Christ means that we should be united with them. But unity is also based upon practice, not just professed belief. If our lives don't match up to our claim of faith in Christ, we betray the fact we don't trust Him at all.

'Such persons' also create obstacles contrary to sound Biblical doctrine. Where saving faith in Christ is enough, some people would insist that we have Christ plus other things like prosperity, works, or baptism. We need to produce fruits in keeping with repentance, but they don't earn our salvation.

'Such persons' are often smooth talking flatterers who deceive the naive. They're entertaining public speakers who are full of motivational pop psychology. Paul is very plain about what our response should be: to avoid such people.

'Heavenly Father, we're sadly aware of counterfeit Christians who seek to deceive people as to the nature of true saving faith. Please help us avoid them, and trust Christ alone, in His name, amen'