Rev. Franklin Graham has long been criticising President Barack Obama for his seeming preference of Islam over Christianity, and now that the U.S. president has just visited a mosque in an alleged attempt to recast the "warped image of Islam," Graham is speaking his mind once again.

"The foundations of this nation have nothing to do with Islam, but everything to do with the Church of Jesus Christ. Islam cannot save anyone from hell or open the gates of heaven. Only One can do that — Jesus Christ, the Son of God who paid the debt of sin for all mankind by giving His life as a sacrifice on Calvary's cross where He suffered and died for our sins, took our sins to the grave, and on the third day God raised Him triumphantly to life," he writes on his Facebook page.

What's even better about Christianity, according to Graham, is that its Saviour is still alive today whereas "Muhammad is dead. I worship a risen Lord! Islam can't compete with that," the evangelist says.

There are several things that Christians and Muslims actually do not agree upon, Graham says. "Islam denies that God has a Son. They deny that Jesus is God. They do not believe in a Triune God – the Father, the Son, and the Holy Spirit," he says.

Because of these differences, Graham worries that jihadists are going to try to infiltrate America and "kill all those who do not follow Islam and expand the territory of the Islamic State to the entire world."

"We have cause to be alarmed at these stories and at the number of potential terrorists," says Graham. "I can tell you – Islam and Christianity clearly do not worship the same God."