It is not a few contradictions it is numerous contradictions on key doctrines which make it totally incoherent. — Andrew4Handel
I think people have an inclination towards laziness. They want those leaders to do everything for them. But as king Solomon says in proverbs, "a person gains wisdom for themselves" (paraphrasing). This means everybody has to develop the capacity to understand life in themselves.
Should people be punished for the sins of their fathers? The Bible gives conflicting answers definitely Yes and definitely No. — Andrew4Handel
Yes, some people will suffer the consequences of those they're associated with. Those who can avoid it, should and often do. It's all a part of being in situations and relations.
Should people be killed definitely yes and definitely no. — Andrew4Handel
Some endeavours e.g. political, could not avoid conflict/violence. Some e.g. religious, could avoid conflict/violence (maybe not always but the propagators often attempted the path of least conflict/violence as best as they could).
Is salvation permanent? Both yes and No. — Andrew4Handel
Those who maintain discipline retain their merits. Those who do not, lose theirs. It also applies to fitness and exercise.
Is marriage a good thing ? Yes or No — Andrew4Handel
Marriage is for those who understand companionship. Those who fill their relationships with negatives (fears, lust, greed, egotism, unhealthy dependence, etc) should not be married. People come together to help each other become better by overcoming personal limitations with the help of the companion, not to drag each other into personal muck.
Neither God nor the bible's teachings stop humans from being and doing what they choose to. The prophets and leaders of the bible were more intelligent than the average of the masses who received those teachings. They seemed to understand the implications of their endeavours (psychologically, socially, politically, etc). For example, when God told Moses that He would send him on the mission, Moses had the presence of mind to question God on his own weakness (stammering) and the strength of the idea (since even the egyptians could perform magic and were stronger politically than the israelites).
Later on, Jesus simplifies the ten commandments into two edicts (something which the religious leaders of the time considered to be heresy of the highest order):
[1.] love God whole-heartedly
[2.] love others as own self
Jesus also taught that the laws were made for man not vice-versa. Unfortunately, this is something we're yet to learn. We're not slaves to our laws (or doctrines), instead, the laws are our servants. They do our bidding. Laws have no power over human will because it's human will which upholds the laws. The ideal is that we should keep transforming laws in such ways that uphold human unity, harmony and freedom. Unfortunately, we are not ideal humans and it takes a while for ideal teachings to attain their respective applications in human activities.
None of the prophets considered their predecessors teachings to be absolute. Instead, they diligently interpreted them with respect to their own circumstances instead of using them as a rigid and unyielding codex. I believe we should learn to do the same. For example, in the mosaic era, God teaches the israelites which animals to eat and which not to. Later on, with Simon Peter, God teaches that everything is suitable as long as God has determined it. Basically, it teaches the need for dealing with situations on a case by case basis according to the merits of the individual aspects instead of a blanket assumption.