Last I checked Jesus Christ existed long before the WT Society, and since salvation only rests with him, guess what, I usually tell them, He's where I'm going to go! Crazy that JWs think they are the only ones that know about Jesus. Like he's someone only they found out about. I know, I used to be one and thought the same thing. Crazy though.
Christ is the end of those establishing righteousness by the decrees, regulations and works of sacrifices of the old covenant pronounced in the law, so that everyone exercising faith in him may have righteousness. This is the "accurate knowledge" that Paul is speaking about and the basic doctrine for salvation, not the thousands of unclear doctrines and zig zagging interpretations of the Watchtower such as 1914 (and the other dates), the other sheep class, the great crowd, blood components, employment on a military base, joining the YMCA, etc., etc. Instead the "love of Christ surpasses all of this knowledge" And this "love," small acts of individual mercy shown to others, is what we are to "add to our faith." (Eph 3:19; Romans 10:1-4; 2 Peter 1:5-8)
I go to church for evening bible studies, go for Sunday worship, joined a ministry to help share the gospel to people in crisis, there are hundreds of places to go that have the true Jesus.