There are signifigant differences in xtian doctrine and what you hear at a levaya.
The main one.
The xtians believe that oso ish suffered and died (the suffering is not as critical as the dying, but since the suffering is mentioned in the passuk they shoehorn this concept into, they talk about it as well) as a means of a “kappara” for all mankind since we can no longer bring karbanos. This is based on another “pshat” they shoehorn into another passuk about “blood” being the only form of kappara available to people. Their doctrine states that unless you believe that oso ish died for your aveiros, you will never, ever have a kaparra and are damned for all eternity. This belief is a lot different that the statement that the ribbono shel olam sometimes brings a punishment on an individual as a means to wake up an entire tzibbur for introspection and tshuva. Moreover, unless each individual does tshuva for their individual situations they are not given a kappara and will be held accountable in shaymayim (in contrast to the xtian doctrine that an individual is not required to do tshuva, or the tshuva doesnt help – depends on the denomination- without believing that oso ish already died for you).
May we all be zoche to a tshuva shlaima and a ksiva vchasima tova.