How many gates are there?

I would find it much harder to believe that meiosis evolved from mitosis many times than that it just evolved once, in fact it would be much easier to believe in God than to believe in this impossibility. On the other hand, we end up with a log jam at the one place were meiosis evolved and it means that every sexually reproducing organism has to go through this gate. We have to have this gate very early in the evolutionary history so all these organisms can get through it. However, there are both animals and plants that reproduce asexually. We must then postulate that there are two gates, one before the meiosis gate and one after the meiosis gate, to evolve from the plant kingdom to the animal kingdom. This is getting very complicated and even supersititious.