A very careful analysis of the bible while being honest with what it teaches about salvation, baptism, the Lord's supper, what a church is, the offices and ordinances of a true N.T. church and the doctrinal practices of a true church will reveal the truth and what demoninations have the truth and or those who are the closest in line with the truth.....and to be honest...if they have the first one or two on the list wrong then they can be alleviated immediately as true and or from God!