... even if someone wants to come in to insult the Christian faith, let me just caution that the premise of this thread is true. If we continue to believe in tradition over the bible, and show the world that we can't count to 3, then how stupid does that make the average Christian look?
In all my years as a Christian -- and I'll admit, I'm not as old in the faith as some here -- I've never had anyone outside the faith raise the issue of how many days Christ was in the grave. I think this concern, Tim, is a straw man. Sorry.
Now, as to these alternate arguments about Thursday or Friday crucifixion, they raise more questions than they answers. For example, note that in Luke 23:56, the women who had purchased spices after the first Sabbath returned and prepared the spices, then “rested on the Sabbath.” The argument states that they could not purchase the spices after the Sabbath, yet prepare those spices before the Sabbath—unless there were two Sabbaths. With the two-Sabbath view, if Christ was crucified on Thursday, then the high holy Sabbath (the Passover) would have begun Thursday at sundown and ended at Friday sundown—at the beginning of the weekly Sabbath or Saturday. Purchasing the spices after the first Sabbath (Passover) would have meant they purchased them on Saturday. No merchant would have broken a Sabbath to sell them burial spices for a "criminal."
The problem with the Wednesday view is that the disciples who walked with Jesus on the road to Emmaus did so on "the same day” of His resurrection (Luke 24:13). The disciples, who do not recognize Jesus, tell Him of Jesus' crucifixion (Luke 24:21) and say that “today is the third day since these things happened” (Luke 24:22). Wednesday to Sunday is four days. Though an explanation could be made that they may have been counting since Wednesday evening at Christ's burial, which begins the Jewish Thursday, and Thursday to Sunday could be counted as three days, it is not a valid one, because Christ had to be buried before sundown, when the Sabbath began, and whether the debaters on this thread accept it or not, the truth is that the Jewish people -- in fact, all the people of the Mideast at that time -- counted a partial day as a full day. We do that ourselves. If we don't see a close friend from Monday evening to early Thursday morning, we might exclaim, "I haven't see you for three days!" But it's been barely over two.
In the grand scheme of things, it really is not all that important to know what day of the week Christ was crucified. I know many of you will protest that, but it simply is not a big deal. If it was, as I mentioned above, the secular world would have glommed onto it as a major argument that the Lord "lied." If it were very important, then God's Word would have clearly communicated the day and timeframe. What is important is that He did die and that He physically, bodily rose from the dead. What is equally important is the reason He died -- to take the punishment that all sinners deserve.
John 3:16 and 3:36 both proclaim that putting your trust in Him results in eternal life. Whether He was crucified on a Wednesday, Thursday, or Friday, that truth remains.