Islam has so many problems, including one which tells that they will straightly go to heaven/paradise if they kill self-declared enemy of Islam, or have 100 virgin woman for sex in the heaven if they die for Islam, etc. quite ridiculous, yo janma ma 1-2 virgin girls sanga jiban bitaunu parne, arko janma (just based on faith) ma more sex with virgin girls, what a attraction to dumb people. 

But, there are also some good things in Islam. For example, for them there is no caste or race and all are allowed to pray or mingle together or even marry betweeen different races (which rarely happens), etc unlike our Hinduism. Some people, for example late Malcoln X, see it a solution for racial discrimination especially in teh US. To some extent it might be, but it is not. For example, Northern Sudan has Arabic popullation and southern Sudan has African population, both are Islam and they were fighting a lot and after 2-3 years from now they will be separated after refferendum. There are hates, killings and discrimination between groups of Islam as well. See in Iraq and Pakistan, one group destroys another groups's Mosq or kill pilgrimmes. People in Islam have less  or no tolerance level especially about other religion criticizing their weak points or about Mohamad, which invites a lot of killings. bad.

But, I met so many people with faith in Islam, almost all of them are very very nice people with good helping attitudes. Especially, I found that Palestian, Labanese, Ezyptian and Iranian are more liberal (taking Halal vs non-halal food, talkign about religion and critism of religions) than Pakisthanis, Bangladeshi, Malasian, Saudi Arabian based on my interactions with few or several menbers from these communities. Muslims in Nepal are the best, they are nice and they can tolerate a lot, they mingle with other communities easily, even eat non-Halal meat.

Finally, all religions are faiths developed to explain unexplained phenomena at the time of their births and they constantly revise their faiths/cultures/practices (except basic/fundamental ones)  based on new or emerging knowledge or facts from science or the societies. Over the time, more and more cultural, social and religious groups will mingle out, make connections, involve in discussions, etc. and also science will shed lights in many phenomena. So, these faiths will be irrelavant completely in next 500-1000 years from now.

No need to curse on one religion or the others now. Let them have faiths on what they believe now and respect their faiths.