How to replace for-loops with a functional statement in C#?

Question

A colleague once said that God is killing a kitten every time I write a for-loop.

When asked how to avoid for-loops, his answer was to use a functional language. However

Answer 1

For loop is, let's say, "bad" as it implies branch prediction in CPU, and possibly performance decrease when branch prediction miss.

But CPU (having a branch prediction accuracy of 97%) and compiler with tecniques like loop unrolling, make loop performance reduction negligible.