The rapture is biblical, BUT I don't agree with the popular view (the pre-tribulation rapture.)
If you set aside all the conditioning and read the bible letting it speak for itself, it becomes very clear that the rapture happens on the last day... so that would be called post-trib, pre-wrath.
Actually, maybe I shouldn't have said 'the popular view' because that has been changing. Many Christians who once believed the pre-trib rapture now believe it is post-tribulation, including some well-known former proponents of pre-trib.
The tribulation was over in 70 AD or with the fall of Masada. That's why the Christians had left for Pella.