Answering the question as written would assume that the 20,000 sects of Christianity are all in opposition of one another and that it is the "seekers" goal to figure out which one is the real winner. On the contrary, many of the 20,000 sects of Christianity are in agreement about the fundamental beliefs of the Christian faith. Rather than making a claim of the sect or sects that have a correct view of Christianity it may be more helpful to identify the "primary" tenants of Christian belief according to Scripture. I will not take the time to point these out here but would encourage you to do so through a careful, diligent, open minded and inductive study of the Scripture. Often times questions such as this are asked in order to point out the supposed futility of the "Christian Faith". However, to judge the validity of the Christian faith on the imperfect practices or disagreements of the professing followers is to confuse the Author with the Reader. Great question, I encourage you to read Mere Christianity by C.S Lewis or Reasonable Faith by William Lane Craig.