We were given a mind with which to reason, analyze, and scrutinize. This is how we arrive at what is true. This is how we develop our belief and values systems.
I agree that the OT doesn’t necessarily fit with the NT in tone (or content as it only prophesied the coming of Christ, and the NT was composed after his coming/teachings). With regard to Marcion, he through out the entire OT, which makes no sense if even a fraction of it is inspired and relevant today (interestingly he also discarded all of the NT not clearly authored by Paul). Considering that Christ often referrenced the OT, Marcions method doesn’t seem that impelling. (for other oddities of Marcion see:
catholic.com/thisrock/1994/9403hotm.asp)
Very true that we were given minds to reason, analyze, and scrutinize. It is important to get to know our faith and our God through our quests for truth. One thing that has helped me come to a better understanding of the OT is good studies involving it’s history, etc.
God bless,
k