No, not unless you see that just about everything in nature has intelligent design. Then it's rational to believe in God.
What's most difficult is not necessarily believing in the existence of a Creator, but in His plan of reconciliation with man by the grace of one, Jesus Christ. His free gift of forgiveness and reconciliation with a perfect God is very hard indeed to rationalize, because it doesn't compute in man's mind that requires justification for wrongs. I kind of think that's the stumbling block with people.
In the simple calculations of men, a lifetime of "good behavior" is the secret, but the Savior taught us that a moment of decision and faith outweighed all that. No human would ever have reached that conclusion. Therefore we know that the wisdom of the Lord is not the ways of men, unlike the rationale of all other "religions."