Terrorism's source is 3rd world, war torn countries where the dominant religion is Islam. Many of those areas didn't necessarily become 3rd world as a result of Muslim dominance directly, but most have turned to a radicalized form of Islam as a reaction to their poverty. From a recruiting standpoint, it makes much more sense for these radical groups to appeal to someone's Muslim faith than to use a minority faith.
Tribalism is common for poor and uneducated people. In areas of extreme North American poverty, this manifests itself in gang membership. Many violent criminals define iden y based on gangs or cartels (worth noting that many of them attend Christian church services, but we don't often dig into the religion/church attendance past of violent criminals who aren't Muslim.) Association with gangs gives them iden y and a perceived sense of power, and "code" gives them direction.
No one can argue that both faiths are used to radicalize criminals equally. But turning this fact into su ion towards all followers of Islam is just more lowbrow tribalism. Most radical Islamic terrorists, particularly in the states, were not radicalized by typical places of Muslim fellowship or worship like their local mosque.