You're asking the one person on this site who wouldn't know. :)
The word Trinity is not mentioned, but the trinity is certainly noted.
Matt 28:19 Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit.
As far as the Rapture, Jesus himself said that he will return only once more. I don’t know where theologians got the notion that he will come in secret and take those who are his and then return 7 years later for those who change their minds.