Reason is a tool to help us better understand and defend our faith; as Anselm put it, ours is a faith that seeks understanding.

Certainty is an unrealistic and unattainable ideal

But the argument is still unsound, because the first premise is false: there are other unmentioned alternatives, for example, that Jesus as described in the gospels is a legendary figure, so that the trilemma is false as it stands.

What differentiates time from space is that time does have a direction. In that sense it is different from space. I think that's certainly true that whereas spatial dimensions don't have direction or an arrow, time does. It runs from past to future. But I see that arrow of time as rooted in a deeper metaphysical reality, namely the reality of temporal becoming - of things coming to be and passing away. That is why time has this arrow. But it's not sufficient to simply say that time and space are distinct because time has a direction. The question will be: why does it have a direction?

The renaissance of Christian philosophy has been accompanied by a resurgence of interest in natural theology, that branch of theology that seeks to prove God's existence apart from divine revelation.

I think Martin Luther correctly distinguished between what he called the magisterial and ministerial uses of reason. The magisterial use of reason occurs when reason stands over and above the gospel like a magistrate and judges it on the basis of argument and evidence. The ministerial use of reason occurs when reason submits to and serves the gospel…. Should a conflict arise between the witness of the Holy Spirit to the fundamental truth of the Christian faith and beliefs based on argument and evidence, then it is the former which must take precedence over the latter.

If you're sincerely seeking God, God will make His existence evident to you.