Where did I say it was ok please? You've misquoted me. The OP provided this list as evidence that she personally wouldn't be able to practice her religion in many countries. It didn't support what she was saying at all. She has yet to provide evidence for her statement - apparently we should just google, although she herself hasn't been able to. She hasn't even listed one country that she is specifically referring to, let alone 'many'. There absolutely are countries that specifically don't allow the public practice of Christianity (Saudi for example) but I don't agree that there are 'many' or that it's actually a reason that we should be more restrictive over our own immigration practices.
Of course it's not ok to persecute someone because of their religion or (to be clear) at all. However, OP was saying that immigration has to be both ways, and because other countries don't accept Christianity the UK shouldn't accept other religions. I think regardless of what side of the immigration debate you sit, the idea that the UK should model its practices on how Christians are treated in the countries you describe
Nigeria isn't an Islamic country btw. It's secular and around half of the population are Christian. That doesn't mean there isn't persecution of Christians in the North in particular, but to describe the country with the largest Christian population in Africa (and one of the largest Christian populations in the world) as 'Islamic' is bizarre.