Thank you for contributing with your questions. I am new here too.
Yes, salvation is a personal, spiritual encounter with God through Jesus, and anyone can come to Christ regardless of scientific understanding. But there are many who have come to faith once the barrier of incredulity was removed through scientific observation and reasoning, so this is an important reason for “bearing witness” in science. To me, evolutionary creationism is an endeavor to understand the actual mechanisms of how God created our natural world with the evidence we have around us. This should not be an affront to faith. It may very well affirm the deeper truths about us and God revealed in the Bible.
The Bible is truth that God has given us to understand Him and us, but of course it does not contain every detail we need to know. The greatest truths are most effectively revealed through stories that are scant in unnecessary details. But he has also given us the ability to reason, think, explore the truth as we live our lives. Loving God with all our minds compels us to grow in these things. I think engaging in this forum should also be an exercise of growth, not just a static exchange of arguments. Darwinian evolution is actually a good model for how this should happen.
We can’t explain everything in the Bible, scientifically or not, and all the whys and hows of God’s miracles may never be understood, so nothing should happen to our faith, except maybe an increase, especially when it happens among us.
I think truth sets us free in the deepest way possible, and humility and honesty is the way to this truth. There are those who begin with the presumption that God cannot exist, and this kind of blind adherence to dogma makes faith impossible.