Jesus is not enough. Believing in Jesus is circular reasoning.
You believe in Jesus because of Jesus?
OK. So here's what makes me believe.
Leaving aside the fact that Jesus presented Himself to me.
This won't help unbelievers - they might even resent it.
How about the Apostles?
Our faith could rest on the fact that the Apostles were honest and courageous men.
We could believe what they've written down for us.
1 John 1:1-4
The Apostles were all hiding when Jesus went to the Cross. Only John was at the foot of the cross. The others were afraid that they would be next and had no power to fight their fear. So they hid in the house of their friends, Mary, Matha and Lazarus.
Some days later, maybe a week or so, they were walking the streets of Jerusalem and proclaiming the word of God and saying what they saw?
What happened to change them? What did they see?
They saw a man who was dead come back to life.
They attested to this with their courage. They all died terrible deaths except for John. By coincidence, the one that was at the foot of the cross. Not that this means to much.
So, yes. We could rest our faith on the Apostles. They saw what they say they saw. It changed them from cowards to true Apostles. We could believe what they saw because we could believe them. We could trust what they told us and believe it to be true.
We could believe everything we're taught about Jesus. His life, His miracles, His teachings. We could believe that He died on a cross and came back to life. Thus we could believe in the resurrection and that He is truly the Son of God.
This is what my faith is based on.
I believe because Jesus is real to me because He presented Himself to me and for all the reasons everyone else here has stated --- that all He told me was true and that Christianity really works.
But my faith is based on the Apostles.
And thus it become a "reasonable" faith.
And this is what I love to tell unbelievers.