IK, I hate to bring it up, but I feel scripture is against you fully on the topic of "evil portals." I won't bring up the last thread, but only the scripture for referance of it.
1 Timothy 4:1-5
"Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; Speaking lies in hypocrisy; having their conscience seared with a hot iron; Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth. For every creature of God is good, and nothing to be refused, if it be received with thanksgiving: For it is sanctified by the word of God and prayer."
Basically, its showing how the things of this world are not sinful. They were made good. This means things like music, sex, affection, food...are good things. To say they should not be enjoyed because of man's ability to cause sin through them is not a biblical stance. In other words, mankind can make sin of anything carnal, and that stands not as a justification to not do the neutral things of the world.
Infact, verse one is probably the most detrimental to your case, and your beliefs that "demonic portals" can influence people. Its specifically saying that casting judgement on people who enjoy neutral things (such as rock and roll, for example) is a sign that they have given into doctrine that believes such portals are possible...thus a sign of a weakness of faith.
Ultimately, there are two lines of theology one can take:
1) Everything is sinful unless proven righteous.
or....
2) Everything is generally not sinful, unless proven sinful.
Verses such as the one above make it pretty clear that the 2nd is the biblical stance. Christianity, again, is a religion of "do's" not "do nots."
