Here's an excellent work on the comparisons. I'll quote a snip, but it goes in to great detail about the similarities.
“A number of early Jewish and Christian documents deal with elements found in modern LDS temples. As such, they are confirmation of the antiquity of our temple rites.1 The volume of information is such that it will not be possible to discuss all aspects in this brief paper. In addition to some of the articles I have written, I would refer you to the temple research written by such LDS researchers as Hugh Nibley, John M. Lundquist, Donald W. Parry, Stephen D. Ricks, and Matthew B. Brown.
Just as an example, let me note that I have, to date, found fifteen early Christian documents that speak of baptism for the dead, along with several Mandaean and Jewish texts. This information will be included in my article “Baptism for the Dead in Early Christianity,” scheduled for publication later this year in another FARMS temples volume.
The article goes on to examine the relationship and similarities with ancient Christian handclasps, initiation, secret words, prayer circles, passing the angels, being admitted into God's presence, etc.
For those thinking that we are merely copying Masonic rituals, this is a must read.
And with that passage you have given us a glimpse into what happens in a Mormon Temple - handclasps, initiation, secret words etc.
But where was there ever documented one instance of a baptism of the dead, or a wedding ceremony sealing a couple (or several women to one man) in the Jerulsalem Temple. Please site it with a non-mormon site if you can.