The false doctrines that involved Jewish myths and endless genealogies was just part of the "traditions of the elders" that "nullify the word of God" (Mark 7) If we hold to the teachings of men, we are hypocrites, our hearts are far from him, and our worship is in vain.
A church that is not following the leadership of the Holy Spirit is not a church that will be in the unity of the Spirit. Only the true gospel produces life. Many "toxic " gospels that are being taught produce sick, weak, unhealthy Christians that do more for the work of Satan than anything else! People are looking for truth in the middle of the chaos of the world and when they look to the church for that truth, too many times all they find is more chaos! So the church is unable to fulfill the great comission until they repent and get back to the word of God and then living it out.