One mark that shows a person or a group of people are off base is when their main emphasis is on some thing other than the two greatest commandments — loving the Lord with all your heart, mind, and strength (living a holy life) and loving your neighbor as yourself (reaching out to the lost, living a life of self denial and being given to helping others).
A few examples of this are the Pentecostals that emphasize speaking in tongues, Saturday keepers that emphasize not working on Saturday, Baptismal Regeneration groups that want to get you baptized in Jesus name for the remission of sins, one true visible church groups that emphasize they are the only church and every one needs to come to them, and the Sacred Name movement that want you to use Yahweh instead of God and Yahshua instead of Jesus. Each of these type of groups tend to over emphasizes their hobby horse at the expensive the first two commandments.
I have been accused of over emphasizing the need for personal holiness and living a sin-free life and I consider that a complement. Jesus came to saved us from our sins not in them (Mat 1:21) and to equip us to be workers for him in his harvest field. To be able to help others we must first get the help we need as no one can lead another person any higher then they are themselves.
In our labors for Jesus we will not be able to influence people to a deep life in Christ than we have ourselves. If we are carnal, prayerless, lacking self denial, and inconsistent in our Christian life that is what we will influence others to be.