Every Muslim have a little ISIS in his head, It show when found a suitable environment .
Not more than any other human of any other background. Some people have a greater probability of becoming violent than others, but this is not based on their skin color or the place where they were born. It can be exacerbated by the same factors that may make a person hyper-religious, but the correlation is not direct causation. The probability of a person becoming violent towards themselves/others is based on a number of factors, including general overall health, feelings of hopelessness, a desire to see change without another method to bring it about, financial situation, support network (eg family, friends), substance abuse or other things that may disrupt normal brain functioning, etc. It's not a direct path from Islam to terrorism, *even if* the numbers were significantly higher for Muslims to turn to violence, which as I have said before, I don't believe has been demonstrated.