Recently, some scientists modeled one of the simplest known cells - that of a bacteria. It took an army of 128 computers running for 10 hours to process the data required in the 25 categories of molecules that are involved in this "simple cells'" life processes.
Think about that for a moment - 128 computers running for 10 hours just to compute the data, not actually do it mind you; but just to model the known processes in one of the simplest known cells, which is many orders of magnitude simpler than a human cell. Wow!
Known mutation rates would require trillions not billions of years to generate a "simple cell". And this does not not take into account the many known multi-generational mutations with intermediate states of mutations that would be needed for shared beneficial mutations across different genes.
For example:
The odds of a single cell possessing non-harmful mutations of five specific (functionally related) genes is the product of their separate probabilities. In other words, the probability is 1 in 10 to the 8 X 1 in 10 to the 8 X 1 in 10 to the 8 X 1 in 10 to the 8 X 1 in 10 to the 8 .......or 1 in 1040.
In other words, if one hundred trillion (10 to the 14) bacteria were produced every second for five billion years (10 to the 17 seconds), the resulting population (10 to the 31) would be only 1/1,000,000,000 of what is needed!
There literally isn't enough time in the universe to accomplish what Evolutionists propose.