In the faith realm we have virtually nothing in common. You have faith in another Jesus and you believe another gospel. Christians are commanded to separate ourselves from apostasy. We should share the biblical gospel, the only gospel that saves, with Mormons, but we cannot join forces with them.
We know that as that day approaches there will be an inculsion and acceptance, in various forms, of all the faiths under the umbrella of a World Religious Council over these various faiths and beliefs.
Evangelicals and others are going into these various religions as the final opportunity for them to seek the true Christ and Christianity before they are so willfully blinded they will accept 'the great deception' when God sends it.....it will be too late then. And that day does appear to be drawing closer as we know.