Why does one person think Catholicms is the truth,another think Baptist is the truth,another think.......?

Christ established one Church only, his Church, the Body of Christ in 33 AD, to which all Christians originally belonged to. During the 16th century, serious dissensions occurred and large communities became separated from full communion with the Catholic Church. They invented their own denominations, and altered their Bibles in protest to the Church. We now have over 30,000 different denominations and cults of Christianity who cannot agree with each other, even on basic Scripture. The ruptures that wound the unity of Christ's Body (heresy,apostasy and schism) do not occur without human sin.