Mmmm, where to start...oh, of course: Thanks for the compliment, on behalf of all of us.
So, Ill start with the simplest. I suppose it is hard to say what went through peoples minds in terms of whether they hated Christians or not, and there will always be people of varying persuasions within any given culture, but on the whole, the impression is that no, monasteries were not looted out of hatred for Christians. They were looted for gold and silver. Period. The monks and priests turned their swords into share plows and were easy prey, and they also lived close to buildings were treasure was amassed. Those were Vikings overseas. It is not a very Norse thing to strike out for a reason like religion its a very complex culture, and not so simple to explain in reasonably short terms.
The early Christian kings, inspired by missionaries, made a point of destroying pagan shrines in Scandinavia, and towards the end of the Iron Age, some heathens then paid them back in kind when they regained power. Those were not necessarily Vikings, though, but rather kings or lords in their own home land exacting revenge.
Going Viking was a rite of passage. Raiding was a very much ingrained practice in terms of politics and religion both, in both the Germanic and Celtic tribes especially during the Bronze Age and the Iron Age. We even have a whole age named for this the Migration Era, which was basically just several big extended raids that moved primarily Germanic, but also Celtic tribes all over Europe until the re-settled in new areas after having gone every which way, backtracking and circling around in various ways. In certain tribes during certain times, one simply could not be a man until one had been part of a raid. Being lordless was the worst fate, because one had no protection, and one gained lords through raids. One became a lord through wealth (not by birth, although birth could give you wealth once you had been born to wealth you still had to prove yourself, though), and wealth was amassed by raiding. The Viking raids of the late Iron Age were just extensions of this much earlier practice. So they did not just boat over to Ireland, they raided for political purpose, and the Gods aided them in this endeavor. The religion developed and changed over time to incorporate and glorify the raid as a way of life. It was an honorable thing to do, because by going over to Ireland (or wherever), you were ensuring that you, your family and your lord had the most loot. Being rich meant that the Gods had given you their favour. That does honour to you, your family, your lord and your gods.
Then again, it was not important to go viking for religious reason per se, sort of. I say sort of, because in the western world of today we separate religion from the other parts of life. The faith and the rest of the world was one and the same for these people, but thats a whole long story. But if you were to separate the religion from the rest of the world like we do today, then one did not have to go viking to go to Valhall. One had to die in battle. That could just as well mean defending ones farm from looters or exacting revenge in one on one combat to settle a blood feud. Going viking was just one way of meeting battle. It still is the Norns that spin your fate. Theyd fight the people whom they raided, those who had the most silver, theyd fight political enemies amongst themselves, theyd fight for vengeance, in holmgång when necessary, but there was a law code in place to prevent this. So, in other words, one was not respected for being a viking, one was respected for being fierce in battle, having the ability to amass wealth and for doing honour to ones family and ones lord. Still, ones voice was only worth as much as the next guys at the Thing, so power was not necessarily what made people respect you. Many powerful men were hated.
Does that big long answer give you any clarity?