We do have a duty to prach and explain. But, we must be aware that some people have hardened their hearts and will never accept Islam. We must avoid wasting time on them and direct our efforts to constructive work.

If you can not reach a person with a gentle touch, you will waste your time trying to pound truth in with a slege hammer. Often a smile and a simple answer to a question is the best Da'wah possible.

Pray Salat as many times as possible for you. Do Dua/Talk to Allah after every session.

Where there is a will, there most certainly is a way!

i believe it is a good thing that you wish to be tolerant of other religions while still staying true to your own. i think this promotes peace, and if all other religions followed this example like you do then we would have a much more peaceful world. you can have your own beliefs while still being tolerant of others. if they say bad things about islam that is their ignorance, but remaining the better person and being tolerant is a good thing i believe for you^^