Tischendorf discovered the
Sinaiticus at St. Catherine’s Monastery (Mount Sinai). It is significant to
remember that it was the premise of Tischendorf that
Receptus, which had been used by the Christian Church for 1850 years (in his day),
was to be REJECTED, because (according to him) it
were erroneous & false texts.
Following in the tradition of "textual criticism," he began substituting other Greek Texts for the traditional Textus Receptus. Tischendorf believed that the Church had been deceived for over 1,800 years.
Sadly, he did not accept that the Bible was the inspired word of God. As a matter of fact, I have never seen any evidence that Tischendorf even claimed to have been a Christian.
Does it Really