shakewell and others, I'm glad to see you are interested in this subject.
A lot about God and the truth can be discovered by digging into this.
Since we are all still growing in our knowledge of God, and are called to entrust ourselves to him, we can frequently be confident of our understanding or beliefs (which itself is not wrong), but still have more to learn, which may or may not change how we view things. God loves and blesses those with a student-like attitude!
Young men, in the same way be submissive to those who are older. All of you, clothe yourselves with humility toward one another, because, “God opposes the proud but gives grace to the humble.” Humble yourselves, therefore, under God’s mighty hand, that he may lift you up in due time. (1 Peter 5:5-6, 1984 NIV)
Regarding human reasoning, one thing to keep in mind is that any Bible passage needs to be interpreted in the context of everything revealed in the Bible. There are no contradictions in Scripture, but there are apparent contradictions. I remember researching a topic and out of 3 views, I agreed with the one I just finished reading about. That included rereading each of them! They all had good Scriptural support.
Ultimately, the full, actual truth can only be known by revelation from God himself. Seek him for understanding and do not put too much faith in your own knowledge or reasoning.
Trust in the LORD with all your heart and lean not on your own understanding; in all your ways acknowledge him, and he will make your paths straight. Do not be wise in your own eyes; fear the LORD and shun evil. (Proverbs 3:5-7, 1984 NIV)
Nor are you to be called ‘teacher,’ for you have one Teacher, the Christ.The greatest among you will be your servant. For whoever exalts himself will be humbled, and whoever humbles himself will be exalted. (Matthew 23:10-12, 1984 NIV)
Regarding child salvation, I like the attitude Jesus prescribed in this passage:
When Peter saw him, he asked, “Lord, what about him?” Jesus answered, “If I want him to remain alive until I return, what is that to you? You must follow me.” (John 21:21-22, 1984 NIV)