Titus 2:13 is indeed one of the most controversial texts that scripture houses. Here is Titus 2:13-14:
"13 while we wait for the blessed hope—the appearing of the glory of our great God and Savior, Jesus Christ, 14 who gave himself for us to redeem us from all wickedness and to purify for himself a people that are his very own, eager to do what is good."
The first interpretation given is that it is speaking of two people, that the text is speaking of the Great God as the Father and the Saviour who is the Son. However this interpretation is hampered by the Granville Sharp's rule of construction.
The second and third interpretation is consistent with the Granville Sharp's rule of construction considering what the rule states. One article I recommend is this one by James White: http://vintage.aomin.org/GRANVILL.html
The second interpretation is that Jesus is the glory of the Great God and Saviour who is the Father. This interpretation has some validity but would not refute the deity of Christ, considering the Bible as a whole teaches the Deity of Yeshua, which I have written on on this blog. Even if Titus 2:13 doesn't teach the Deity of Christ, there are more texts out there which indicate his deity anyway. This interpretation states that Jesus is the glory of the God and Saviour that appears.
The third interpretation is that Jesus is the Great God and Saviour in Titus 2:13 which most are familiar with and has been held by many such as James White, Edward Dalcour, Robert Bowman and many others.
Even if Titus 2:13 was not a text for the Deity of Christ, you still have to take into consideration that God is the primary designation of the Father and Lord is the primary designation of the Son. I thoroughly recommend you read my article response to Tovia Singer where I speak on 1 Corinthians 8:4-6: http://answering-judaism.blogspot.co.uk/2013/10/response-to-tovia-singer-on-did-authors.html
Study Titus carefully and see what it is saying.